[llvm] [InstCombine] Simplify multi use cast of Phi with constant inputs (PR #186621)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
index 6a60244cc..54ad48dec 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -237,13 +237,13 @@ Instruction *InstCombinerImpl::commonCastTransforms(CastInst &CI) {
     // legal type.
     if (!Src->getType()->isIntegerTy() || !CI.getType()->isIntegerTy() ||
         shouldChangeType(CI.getSrcTy(), CI.getType()))
-      if (Instruction *NV = foldOpIntoPhi(
-              CI, PN,
-              /*AllowMultipleUses=*/
-                  is_contained({Instruction::Trunc, Instruction::ZExt,
-                                Instruction::SExt},
-                               CI.getOpcode()) &&
-                  all_of(PN->operands(), IsaPred<ConstantInt>)))
+      if (Instruction *NV =
+              foldOpIntoPhi(CI, PN,
+                            /*AllowMultipleUses=*/
+                            is_contained({Instruction::Trunc, Instruction::ZExt,
+                                          Instruction::SExt},
+                                         CI.getOpcode()) &&
+                                all_of(PN->operands(), IsaPred<ConstantInt>)))
         return NV;
   }
 

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https://github.com/llvm/llvm-project/pull/186621