cpu: Rename x86-64-v1 to x86-64.

This is the actual micro-architecture designation used by compilers.

* gnu/packages/gcc.scm (%gcc-11-x86_64-micro-architectures): Rename
x86-64-v1 to x86-64.
* gnu/packages/golang.scm (%go-1.18-x86_64-micro-architectures): Same.
* guix/cpu.scm (cpu->micro-architecture-level): Same.
(gcc-architecture->micro-architecture-level): Same.

Change-Id: I19ed556a7e8deb4a77f4c63fca3b794f25092788

gnu/packages/gcc.scm

@@ -624,7 +624,7 @@ Go.  It also includes runtime support libraries for these languages.")
             "btver1" "btver2"                     ;AMD
 
             ;; psABI micro-architecture levels
-            "x86-64-v1" "x86-64-v2" "x86-64-v3" "x86-64-v4")))
+            "x86-64" "x86-64-v2" "x86-64-v3" "x86-64-v4")))
 
 ;; Suitable '-march' values for GCC 12.
 (define %gcc-12-aarch64-micro-architectures

gnu/packages/golang.scm

@@ -870,7 +870,8 @@ in the style of communicating sequential processes (@dfn{CSP}).")
          ("powerpc64le" ,@%go-1.17-powerpc64le-micro-architectures))))))
 
 (define %go-1.18-x86_64-micro-architectures
-  (list "x86-64-v1" "x86-64-v2" "x86-64-v3" "x86-64-v4"))
+  ;; GOAMD defaults to 'v1' so we match the default elsewhere.
+  (list "x86-64" "x86-64-v2" "x86-64-v3" "x86-64-v4"))
 
 (define-public go-1.18
   (package

guix/cpu.scm

@@ -294,8 +294,8 @@ correspond roughly to CPU, a record as returned by 'current-cpu'."
              ("avx" "avx2" "bmi1" "bmi2" "f16c" "fma" "movbe"
               "popcnt" "sse3" "sse4_1" "sse4_2" "ssse3" => "x86-64-v3")
              ("popcnt" "sse3" "sse4_1" "sse4_2" "ssse3" => "x86-64-v2")
-             (_ => "x86-64-v1")))
-         "x86-64-v1"))
+             (_ => "x86-64")))
+         "x86-64"))
     (architecture
      ;; TODO: More architectures
      architecture)))
@@ -321,5 +321,5 @@ CPUs for compilers which don't allow for more focused optimizing."
          "btver2" "athalon" "k8-sse3" "k8" "bdver3" "bdver2" "bdver1" "btver1"
          "amdfam10"
          "lujiazui" "yongfeng" "x86-64")
-     "x86-64-v1")
+     "x86-64")
     (_ gcc-architecture)))