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

[Brox Chen via llvm-commits]

broxigarchen wrote:

There are quite a number of changes being merged to enable the true16 mode on gfx11, and a set of testing are ran including lit test, cts test and performance test.  We think it's the time now to try turning this mode on as default. Please let me know if there are still concerns needed to be addresss before merging this. Thanks!

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