[llvm] [ValueTraking] Improve KnownFPClass for fadd. Handle infinity signs and strict sign cases (PR #190559)

[via llvm-commits]

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/Support/KnownFPClass.h llvm/lib/Support/KnownFPClass.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/Support/KnownFPClass.cpp b/llvm/lib/Support/KnownFPClass.cpp
index 9a0644774..67d62328c 100644
--- a/llvm/lib/Support/KnownFPClass.cpp
+++ b/llvm/lib/Support/KnownFPClass.cpp
@@ -323,7 +323,6 @@ static KnownFPClass fadd_impl(const KnownFPClass &KnownLHS,
         KnownRHS.cannotBeOrderedLessEqZero(Mode))
       Known.knownNot(fcZero);
 
-
     // This can't underflow if one of the operands is known normal.
     if (KnownLHS.isKnownNever(fcZero | fcNegSubnormal) ||
         KnownRHS.isKnownNever(fcZero | fcNegSubnormal))

``````````

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https://github.com/llvm/llvm-project/pull/190559