[llvm] [LLVM][APFloat] Add APFloat support for 8-bit UE5M3 type (PR #210720)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/ADT/APFloat.h llvm/lib/Support/APFloat.cpp llvm/unittests/ADT/APFloatTest.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/ADT/APFloatTest.cpp b/llvm/unittests/ADT/APFloatTest.cpp
index 5fb3389ea..8b80b46e3 100644
--- a/llvm/unittests/ADT/APFloatTest.cpp
+++ b/llvm/unittests/ADT/APFloatTest.cpp
@@ -10117,7 +10117,8 @@ TEST(APFloatTest, Float8E5M3FNUExhaustivePair) {
 
 TEST(APFloatTest, Float8E5M3FNUExhaustive) {
   // Test each of the 256 Float8E5M3FNU values.
-  // Layout: 5 exponent bits + 3 mantissa bits, bias = 15, NaN = 0xFF (all-ones).
+  // Layout: 5 exponent bits + 3 mantissa bits, bias = 15, NaN = 0xFF
+  // (all-ones).
   for (int i = 0; i < 256; i++) {
     APFloat test(APFloat::Float8E5M3FNU(), APInt(8, i));
     SCOPED_TRACE("i=" + std::to_string(i));

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https://github.com/llvm/llvm-project/pull/210720