[libc][math] Refactor copysign Math Functions to Header Only

[hulxv]

This is tracking issue to refactor copysign math functions currently implemented in LLVM libc to be header-only.

part of: #147386

Target Functions:

• copysign
• copysignbf16
• copysignf
• copysignf128
• copysignf16
• copysignl

CC: @bassiounix

[llvmbot]

@llvm/issue-subscribers-libc

Author: Mohamed Emad (hulxv)

Details

This is tracking issue to refactor copysign math functions currently implemented in LLVM libc to be header-only.

part of: #147386

Target Functions:

• copysign
• copysignbf16
• copysignf
• copysignf128
• copysignf16
• copysignl

CC: @bassiounix