[clang] [PowerPC] Fix incorrect store alignment for __builtin_vsx_build_pair() (PR #108606)

[Eli Friedman via cfe-commits]

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@@ -18197,7 +18197,7 @@ Value *CodeGenFunction::EmitPPCBuiltinExpr(unsigned 
BuiltinID,
       CallOps.push_back(Ops[i]);
     llvm::Function *F = CGM.getIntrinsic(ID);
     Value *Call = Builder.CreateCall(F, CallOps);
-    return Builder.CreateAlignedStore(Call, Ops[0], MaybeAlign(64));
+    return Builder.CreateAlignedStore(Call, Ops[0], MaybeAlign());
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efriedma-quic wrote:

I'd prefer to just explicitly write the expected alignment here, though; LLVM 
DataLayout rules for alignment can be a bit strange.

https://github.com/llvm/llvm-project/pull/108606
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