Revert "[TargetVersion] Only enable on RISC-V and AArch64 (#115991)"

This reverts commit 922282e.

Author: BeMg

clang/docs/ReleaseNotes.rst

@@ -459,8 +459,6 @@ Attribute Changes in Clang
 - Clang now supports ``[[clang::lifetime_capture_by(X)]]``. Similar to lifetimebound, this can be
   used to specify when a reference to a function parameter is captured by another capturing entity ``X``.
 
-- The ``target_version`` attribute is now only supported for AArch64 and RISC-V architectures.
-
 Improvements to Clang's diagnostics
 -----------------------------------
 

clang/include/clang/Basic/Attr.td

@@ -3297,7 +3297,7 @@ def Target : InheritableAttr {
   }];
 }
 
-def TargetVersion : DeclOrTypeAttr, TargetSpecificAttr<TargetArch<!listconcat(TargetAArch64.Arches, TargetRISCV.Arches)>> {
+def TargetVersion : InheritableAttr {
   let Spellings = [GCC<"target_version">];
   let Args = [StringArgument<"NamesStr">];
   let Subjects = SubjectList<[Function], ErrorDiag>;