[llvm] [AMDGPU] Set glc bit for nontemporal loads on GFX10/11 (PR #89739)

[Tony Tye via llvm-commits]

t-tye wrote:

I do not remember the details, but I suspect the choice relates to desiring a cache policy of HIT_EVICT. The chosen settings achieve that for L1. L0 is very small, so in general it is unlikely leaving a value in it has any impact on performance as it will be evicted naturally.

https://github.com/llvm/llvm-project/pull/89739