[llvm] [KnownFPClass] Refine known classes for `KnownFPClass::bitcast` (PR #215708)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/unittests/Support/KnownFPClassTest.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/unittests/Support/KnownFPClassTest.cpp b/llvm/unittests/Support/KnownFPClassTest.cpp
index 6e38458b9..37148163e 100644
--- a/llvm/unittests/Support/KnownFPClassTest.cpp
+++ b/llvm/unittests/Support/KnownFPClassTest.cpp
@@ -17,15 +17,13 @@ using namespace llvm;
 
 namespace {
 
-static KnownFPClass bitcast(const fltSemantics &Semantics,
-                            const APInt &Value) {
+static KnownFPClass bitcast(const fltSemantics &Semantics, const APInt &Value) {
   return KnownFPClass::bitcast(Semantics, KnownBits::makeConstant(Value));
 }
 
 static void expectKnown(FPClassTest ExpectedClasses,
                         std::optional<bool> ExpectedSignBit,
-                        const fltSemantics &Semantics,
-                        const KnownBits &Bits) {
+                        const fltSemantics &Semantics, const KnownBits &Bits) {
   KnownFPClass Known = KnownFPClass::bitcast(Semantics, Bits);
   EXPECT_EQ(ExpectedClasses, Known.KnownFPClasses);
   EXPECT_EQ(ExpectedSignBit, Known.SignBit);

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https://github.com/llvm/llvm-project/pull/215708