[clang] [clang] Limit alignment for emitted vectors (PR #98629)

[Phoebe Wang via cfe-commits]

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@@ -133,6 +133,7 @@ struct TransferrableTargetInfo {
   unsigned short SuitableAlign;
   unsigned short NewAlign;
   unsigned MaxVectorAlign;
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phoebewang wrote:

That makes sense. Passing/returning vector larger than target capacity (e.g. <4 
x i64> without AVX) is ABI undefined behavior. The sret change matches with 
GCC, but may result in compatibility for Clang. Maybe we won't care it much.

https://github.com/llvm/llvm-project/pull/98629
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