[llvm] [llvm:codegen] Add lowering to all intrinsics available in `math.h`. (PR #162825)

[Ingo Müller via llvm-commits]

ingomueller-net wrote:

I haven't work with codegen before and only limited on LLVM outside of MLIR. Can you give me some pointers?

https://github.com/llvm/llvm-project/pull/162825