gnu: llvm-9: Standardize patch level.

Having a non-standard (different than 1) patch level requirement means the
patches cannot be composed easily from different origins.  The following
command was used to remove one level from the llvm-9 patches:

  sed -e 's|^--- a/|--- |' -e 's|^+++ b/|+++ |' \
      gnu/packages/patches/llvm-9* -i

* gnu/packages/llvm.scm (llvm-9)[source]: Drop the patch-flags field.
Re-indent list of patches.
* gnu/packages/patches/llvm-9-fix-bitcast-miscompilation.patch: Strip one level.
* gnu/packages/patches/llvm-9-fix-lpad-miscompilation.patch: Likewise.
* gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch: Likewise.

gnu/packages/llvm.scm

@@ -602,11 +602,10 @@ of programming tools as well as libraries with equivalent functionality.")
        (sha256
         (base32
          "16hwp3qa54c3a3v7h8nlw0fh5criqh0hlr1skybyk0cz70gyx880"))
-       (patch-flags '("-p2"))
        (patches (search-patches
-                  "llvm-9-fix-bitcast-miscompilation.patch"
-                  "llvm-9-fix-scev-miscompilation.patch"
-                  "llvm-9-fix-lpad-miscompilation.patch"))))))
+                 "llvm-9-fix-bitcast-miscompilation.patch"
+                 "llvm-9-fix-scev-miscompilation.patch"
+                 "llvm-9-fix-lpad-miscompilation.patch"))))))
 
 (define-public clang-runtime-9
   (clang-runtime-from-llvm

gnu/packages/patches/llvm-9-fix-bitcast-miscompilation.patch

@@ -36,8 +36,8 @@ Differential Revision: https://reviews.llvm.org/D70844
 
 diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
 index 2c9ba203fbf3..0af3de300e77 100644
---- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
-+++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+--- llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
++++ llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
 @@ -18,6 +18,7 @@
  #include "llvm/IR/DIBuilder.h"
  #include "llvm/IR/PatternMatch.h"
@@ -158,8 +158,8 @@ index 2c9ba203fbf3..0af3de300e77 100644
  
 diff --git a/llvm/test/Transforms/InstCombine/cast.ll b/llvm/test/Transforms/InstCombine/cast.ll
 index b6d1eda0601d..3ce8de033422 100644
---- a/llvm/test/Transforms/InstCombine/cast.ll
-+++ b/llvm/test/Transforms/InstCombine/cast.ll
+--- llvm/test/Transforms/InstCombine/cast.ll
++++ llvm/test/Transforms/InstCombine/cast.ll
 @@ -824,7 +824,7 @@ define i64 @test59(i8 %A, i8 %B) {
  
  define <3 x i32> @test60(<4 x i32> %call4) {

gnu/packages/patches/llvm-9-fix-lpad-miscompilation.patch

@@ -15,8 +15,8 @@ PR45261
 
 diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
 index 5ac3606dc662..2638b1e8a05c 100644
---- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
-+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+--- llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
++++ llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
 @@ -225,6 +225,21 @@ static bool isRegUsedByPhiNodes(unsigned DefReg,
    return false;
  }
@@ -50,8 +50,8 @@ index 5ac3606dc662..2638b1e8a05c 100644
      }
 diff --git a/llvm/test/CodeGen/X86/sink-local-value.ll b/llvm/test/CodeGen/X86/sink-local-value.ll
 index b0e511ac1189..f7d861ac9b6c 100644
---- a/llvm/test/CodeGen/X86/sink-local-value.ll
-+++ b/llvm/test/CodeGen/X86/sink-local-value.ll
+--- llvm/test/CodeGen/X86/sink-local-value.ll
++++ llvm/test/CodeGen/X86/sink-local-value.ll
 @@ -145,6 +145,42 @@ try.cont:                                         ; preds = %entry, %lpad
  ; CHECK:         retl
  

gnu/packages/patches/llvm-9-fix-scev-miscompilation.patch

@@ -21,8 +21,8 @@ llvm-svn: 373184
 
 diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
 index 354ae05bb841..c29fc5dbccfb 100644
---- a/llvm/lib/Analysis/ScalarEvolution.cpp
-+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
+--- llvm/lib/Analysis/ScalarEvolution.cpp
++++ llvm/lib/Analysis/ScalarEvolution.cpp
 @@ -4992,7 +4992,7 @@ const SCEV *ScalarEvolution::createSimpleAffineAddRec(PHINode *PN,
    // overflow.
    if (auto *BEInst = dyn_cast<Instruction>(BEValueV))
@@ -34,8 +34,8 @@ index 354ae05bb841..c29fc5dbccfb 100644
  }
 diff --git a/llvm/test/Analysis/ScalarEvolution/limit-depth.ll b/llvm/test/Analysis/ScalarEvolution/limit-depth.ll
 index db68a4f84c91..6fdf8c5df974 100644
---- a/llvm/test/Analysis/ScalarEvolution/limit-depth.ll
-+++ b/llvm/test/Analysis/ScalarEvolution/limit-depth.ll
+--- llvm/test/Analysis/ScalarEvolution/limit-depth.ll
++++ llvm/test/Analysis/ScalarEvolution/limit-depth.ll
 @@ -46,7 +46,7 @@ define void @test_mul(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) {
  define void @test_sext(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f) {
  ; CHECK-LABEL: @test_sext
@@ -47,8 +47,8 @@ index db68a4f84c91..6fdf8c5df974 100644
  
 diff --git a/llvm/test/Analysis/ScalarEvolution/nsw.ll b/llvm/test/Analysis/ScalarEvolution/nsw.ll
 index 69427368625d..ca24f9d4a04b 100644
---- a/llvm/test/Analysis/ScalarEvolution/nsw.ll
-+++ b/llvm/test/Analysis/ScalarEvolution/nsw.ll
+--- llvm/test/Analysis/ScalarEvolution/nsw.ll
++++ llvm/test/Analysis/ScalarEvolution/nsw.ll
 @@ -163,7 +163,7 @@ bb5:                                              ; preds = %bb2
  declare void @f(i32)
  
@@ -60,8 +60,8 @@ index 69427368625d..ca24f9d4a04b 100644
    %add = add nsw i32 %v, 1
 diff --git a/llvm/test/Analysis/ScalarEvolution/trip-count12.ll b/llvm/test/Analysis/ScalarEvolution/trip-count12.ll
 index 5e7d72d5e4f3..d0086ee2e6ac 100644
---- a/llvm/test/Analysis/ScalarEvolution/trip-count12.ll
-+++ b/llvm/test/Analysis/ScalarEvolution/trip-count12.ll
+--- llvm/test/Analysis/ScalarEvolution/trip-count12.ll
++++ llvm/test/Analysis/ScalarEvolution/trip-count12.ll
 @@ -1,7 +1,7 @@
  ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
  
@@ -73,8 +73,8 @@ index 5e7d72d5e4f3..d0086ee2e6ac 100644
  define zeroext i16 @test(i16* nocapture %p, i32 %len) nounwind readonly {
 diff --git a/llvm/test/Analysis/ScalarEvolution/trip-count9.ll b/llvm/test/Analysis/ScalarEvolution/trip-count9.ll
 index c0a1d12fa00e..9a080b34743f 100644
---- a/llvm/test/Analysis/ScalarEvolution/trip-count9.ll
-+++ b/llvm/test/Analysis/ScalarEvolution/trip-count9.ll
+--- llvm/test/Analysis/ScalarEvolution/trip-count9.ll
++++ llvm/test/Analysis/ScalarEvolution/trip-count9.ll
 @@ -179,7 +179,7 @@ exit:
  }