[llvm] [DAG] computeKnownFPClass - add ISD::SINT_TO_FP/UINT_TO_FP handling (PR #190539)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/Support/KnownFPClass.h llvm/lib/Analysis/ValueTracking.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp 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 11ce35d2f..e519a443f 100644
--- a/llvm/lib/Support/KnownFPClass.cpp
+++ b/llvm/lib/Support/KnownFPClass.cpp
@@ -290,14 +290,14 @@ KnownFPClass KnownFPClass::bitcast(const fltSemantics &FltSemantics,
 static KnownFPClass itofp_impl(const KnownBits &KnownSrc,
                                const fltSemantics &FltSem, bool IsSigned) {
   KnownFPClass Known;
-  
+
   Known.knownNot(fcNan);
   Known.knownNot(fcSubnormal);
   Known.knownNot(fcNegZero);
-    
+
   if (!IsSigned)
-      Known.signBitMustBeZero();
-  
+    Known.signBitMustBeZero();
+
   if (KnownSrc.isNonZero())
     Known.knownNot(fcZero);
 

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https://github.com/llvm/llvm-project/pull/190539