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

[Ingo Müller via llvm-commits]

ingomueller-net wrote:

Converted to draft because it seems like this isn't the agreed-upon next step and nobody is actively working on it.

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