[llvm] [InstSimplify] Stop propagating `undef` when element is demanded (PR #75746)

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``````````bash
git-clang-format --diff 6655581038f8479f0f6942b7d34cbd6556d00a0e 2797317b8049f7a73abab11fa70708bf51be2c19 -- llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
index 4e314780c1..2490f5b9b9 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
@@ -1378,7 +1378,7 @@ Value *InstCombinerImpl::SimplifyDemandedVectorElts(Value *V,
       if (!Elt) return nullptr;
 
       Elts.push_back(Elt);
-      if (isa<PoisonValue>(Elt))   // Already poison.
+      if (isa<PoisonValue>(Elt)) // Already poison.
         UndefElts.setBit(i);
     }
 

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https://github.com/llvm/llvm-project/pull/75746