[llvm] [msan] Handle llvm.x86.vcvtps2ph.128/256 explicitly (PR #130705)

[Thurston Dang via llvm-commits]

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@@ -4868,6 +4928,12 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
       break;
     }
 
+    case Intrinsic::x86_vcvtps2ph_128:
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thurstond wrote:

After more investigation kicked off by a discussion with Dillon internally (b/397863125#comment13): vcvtph2ps is automatically "upgraded" by LLVM into the "fpext" intrinsic, which is handled by MemorySanitizer (but not perfectly).

https://github.com/llvm/llvm-project/pull/130705