[llvm] [AMDGPU][True16] set true16 mode as default on gfx110x (PR #140736)

[Brox Chen via llvm-commits]

broxigarchen wrote:

> > I see. Discussed offline with @Sisyph. I think the t16 mode asm inline is not yet supported. But I am not sure if it is blocking. The asm inline should still work with fake16 mode, and after this patch, the codegen can still be configured to use fake16 mode through the mattr setting, until when t16 inline is supported
> 
> I think it will be blocking, but it is not hard to add a new constraint.

Opened a PR here https://github.com/llvm/llvm-project/pull/140946

https://github.com/llvm/llvm-project/pull/140736