[llvm] [AMDGPU] [GlobalIsel] Combine Fmul with Select into ldexp instruction. (PR #120104)

[Vikash Gupta via llvm-commits]

vg0204 wrote:

TO DO :

1. Identify the most ideal place to invoke this combine (pre or post legalization or BOTH).
2. Update the test cases following it.


https://github.com/llvm/llvm-project/pull/120104