[llvm] [InstSimplify] Fold fsub X, X using known non-NaN/non-Inf facts (PR #200782)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Analysis/InstructionSimplify.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/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index 6c110d1fd..8ee55235e 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -6029,8 +6029,7 @@ simplifyFSubInst(Value *Op0, Value *Op1, FastMathFlags FMF,
 
   // fsub nnan x, x ==> 0.0
   // fsub x, x ==> 0.0 if x is known never Inf or NaN
-  if (Op0 == Op1 &&
-      (FMF.noNaNs() || isKnownNeverInfOrNaN(Op0, Q)))
+  if (Op0 == Op1 && (FMF.noNaNs() || isKnownNeverInfOrNaN(Op0, Q)))
     return Constant::getNullValue(Op0->getType());
 
   if (FMF.noNaNs()) {

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https://github.com/llvm/llvm-project/pull/200782