[clang] [FMV][AIX] Implement target_clones (cpu-only) (PR #177428)

[Alexandros Lamprineas via cfe-commits]

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@@ -3053,9 +3008,11 @@ bool CodeGenModule::GetCPUAndFeaturesAttributes(GlobalDecl GD,
     // While we populated the feature map above, we still need to
     // get and parse the target attribute so we can get the cpu for
     // the function.
-    if (TD) {
-      ParsedTargetAttr ParsedAttr =
-          Target.parseTargetAttr(TD->getFeaturesStr());
+    StringRef FeatureStr =
+        TD ? TD->getFeaturesStr()
+           : (TC ? TC->getFeatureStr(GD.getMultiVersionIndex()) : StringRef());
+    if (!FeatureStr.empty()) {
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labrinea wrote:

This doesn't seem right. You are parsing the target_clones attribute using `parseTargetAttr` which may be fine for PPC but may not be the case for other targets which support the target_clones attribute, like AArch64.

https://github.com/llvm/llvm-project/pull/177428