[libc][math] Tracking Issue - Refactor `FMA` Math Functions to Header Only

[bassiounix]

This is tracking issue to refactor fma math functions in single and double precision currently implemented in LLVM libc to be header-only.

[llvmbot]

@llvm/issue-subscribers-libc

Author: Muhammad Bassiouni (bassiounix)

Details

This is tracking issue to refactor `fma` math functions in single and double precision currently implemented in LLVM libc to be header-only.