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

[via llvm-commits]

================
@@ -474,6 +474,11 @@ math_test(
 
 # TODO: Add fma, fmaf, fmal, fmaf128 tests.
 
+math_test(
+    name = "fmaf16",
+    hdrs = ["FMaxTest.h"],
+)
----------------
overmighty wrote:

```suggestion
math_test(
    name = "fmaf16",
    hdrs = ["FmaTest.h"],
)
```

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