[clang] [flang] [Flang][AArch64][VecLib] Add libmvec support for Flang/AArch64 (PR #146453)

[KAWASHIMA Takahiro via cfe-commits]

kawashima-fj wrote:

`sinh` is not converted to the libmvec function currently. I did not investigate the reason yet. In FIR, most math functions are converted to `math` dialect (`%23 = math.cosh %22 fastmath<fast> : f64`) but `sinh` is not converted to `math` dialect (`%23 = fir.call @sinh(%22) fastmath<fast> : (f64) -> f64`). It's the difference I found. Is it an expected difference?

https://github.com/llvm/llvm-project/pull/146453