[clang] [TargetVersion] Only enable on RISC-V and AArch64 (PR #115991)

[Craig Topper via cfe-commits]

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@@ -3282,6 +3282,8 @@ def warn_unsupported_target_attribute
               "attribute string; '%select{target|target_clones|target_version}3' "
               "attribute ignored">,
       InGroup<IgnoredAttributes>;
+def err_target_version_unsupported
+    : Error<"target_version attribute is not supported in this target">;
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topperc wrote:

"in this target" -> "on this target"

https://github.com/llvm/llvm-project/pull/115991