[llvm] [KnownFPClass] Add support for non-intrinsic math libcalls (PR #216234)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/Support/KnownFPClass.h llvm/lib/Analysis/ValueTracking.cpp llvm/lib/Support/KnownFPClass.cpp llvm/unittests/Analysis/ValueTrackingTest.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/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 2d8c9ca78..b022c00d9 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -5799,9 +5799,8 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
         const Function *Caller = II->getFunction();
         const fltSemantics &FltSem =
             Op->getType()->getScalarType()->getFltSemantics();
-        DenormalMode Mode =
-            Caller ? Caller->getDenormalMode(FltSem)
-                   : DenormalMode::getDynamic();
+        DenormalMode Mode = Caller ? Caller->getDenormalMode(FltSem)
+                                   : DenormalMode::getDynamic();
         Known = KnownFPClass::cbrt(KnownSrc, Mode);
         break;
       }

``````````

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https://github.com/llvm/llvm-project/pull/216234