[llvm] [DirectX] Add support for typedBufferLoad and Store for RWBuffer<double2> and RWBuffer<double> (PR #139996)

[Farzon Lotfi via llvm-commits]

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@@ -532,6 +541,80 @@ static Value *expandRadiansIntrinsic(CallInst *Orig) {
   return Builder.CreateFMul(X, PiOver180);
 }
 
+static void expandTypedBufferLoadIntrinsic(CallInst *Orig) {
+  IRBuilder<> Builder(Orig);
+
+  unsigned ExtractNum =
+      Orig->getType()->getStructElementType(0)->isVectorTy() ? 4 : 2;
+  Type *Ty = VectorType::get(Builder.getInt32Ty(), ExtractNum, false);
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farzonl wrote:

I could see a case for all even number cases/ because we could loop the as double ans splitdouble cases. But `<23 x double>` should always be wrong.

https://github.com/llvm/llvm-project/pull/139996