[clang] [flang] [llvm] Initial support for vectorization using HVML (Hygon vector math library) (PR #219098)

[Xiaomeng Zhang via cfe-commits]

JacketPants wrote:

Ping @RKSimon @phoebewang.

This PR adds initial support for HVML as a vector math library.
It follows the existing vector library integration approach used by LLVM.

Could you please take a look when you have time?

Thanks!

https://github.com/llvm/llvm-project/pull/219098