[llvm] [SelectionDAG] Update MemOp to distinguish memmove from memcpy (PR #206005)

[Ömer Sinan Ağacan via llvm-commits]

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@@ -1229,7 +1229,8 @@ int ARMTTIImpl::getNumMemOps(const IntrinsicInst *I) const {
     const Align DstAlign = MC->getDestAlign().valueOrOne();
     const Align SrcAlign = MC->getSourceAlign().valueOrOne();
 
-    MOp = MemOp::Copy(Size, /*DstAlignCanChange*/ false, DstAlign, SrcAlign,
+    // Use the most restrictive of memset, memcpy, memmove.
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osa1 wrote:

Yeah, I don't think you even had a way to distinguishing them before this PR. (otherwise I'd suggest it in #196285 and not create this PR)

https://github.com/llvm/llvm-project/pull/206005