[libc] [llvm] [libc][math][c23] Add fmaf16 C23 math function. (PR #130757)

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``````````bash
git-clang-format --diff 2e39533e5055bc82bf5a1b2a888e5d65a33e72f9 5f2b38438ce8d7db58d3b421084a127913dbb4d9 --extensions h,cpp -- libc/src/math/fmaf16.h libc/src/math/generic/fmaf16.cpp libc/test/src/math/fmaf16_test.cpp libc/test/src/math/smoke/fmaf16_test.cpp libc/test/src/math/smoke/FmaTest.h libc/utils/MPFRWrapper/MPFRUtils.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/libc/test/src/math/smoke/FmaTest.h b/libc/test/src/math/smoke/FmaTest.h
index d044a9818a..9752e07f4c 100644
--- a/libc/test/src/math/smoke/FmaTest.h
+++ b/libc/test/src/math/smoke/FmaTest.h
@@ -90,8 +90,8 @@ public:
     // Test overflow.
     OutType z = out.max_normal;
     InType in_z = LIBC_NAMESPACE::fputil::cast<InType>(out.max_normal);
-      EXPECT_FP_EQ_ALL_ROUNDING(OutType(0.75) * z,
-                                func(InType(1.75), in_z, -in_z));
+    EXPECT_FP_EQ_ALL_ROUNDING(OutType(0.75) * z,
+                              func(InType(1.75), in_z, -in_z));
 
     // Exact cancellation.
     EXPECT_FP_EQ_ROUNDING_NEAREST(

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https://github.com/llvm/llvm-project/pull/130757