[llvm] Added fix to enable constant folding that is missing for math library functions (scalbln , scalbn, ldexp) (PR #169893)

[Raja Sudha Sri Harika via llvm-commits]

Sriharika1506 wrote:

@dtcxzyw We are working in a team along with @ashwinagrl. 

https://github.com/llvm/llvm-project/pull/169893