[llvm] [InstCombine] Transform high latency, dependent FSQRT/FDIV into FMUL (PR #87474)

[Sushant Gokhale via llvm-commits]

sushgokh wrote:

@arsenm fmul(x, 1/y) is being transformed to fdiv(x, y) post my transform(in the instcombine pass itself). This is deleting some of the fastmath flags and fpmath metadata and I verified this by dumping the tests output post transform. This issue has started happening recently.
So, expect some missing flags/metadata in the tests

https://github.com/llvm/llvm-project/pull/87474