[llvm] [InstCombine] Optimistically allow multiple shufflevector uses in foldOpPhi (PR #114278)

[Yingwei Zheng via llvm-commits]

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@@ -1773,17 +1773,33 @@ Instruction *InstCombinerImpl::foldOpIntoPhi(Instruction &I, PHINode *PN) {
   if (NumPHIValues == 0)
     return nullptr;
 
-  // We normally only transform phis with a single use.  However, if a PHI has
-  // multiple uses and they are all the same operation, we can fold *all* of the
-  // uses into the PHI.
+  // We normally only transform phis with a single use.
+  bool AllUsesIdentical = false;
+  bool MultipleUses = false;
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dtcxzyw wrote:

`MultipleUses` is misleading. `MultipleShuffleVectorUses` would be better.


https://github.com/llvm/llvm-project/pull/114278