[AMDGPU] Use tablegen to list uniform intrinsics

[AMDGPU] Use tablegen to list uniform intrinsics

Right now we do opcode wise matching to identify uniform/non-divergent
AMDGPU intrinsics. It is duplicated at 2 places once at IR level uniformity analysis
and at MIR level. Moving them to single tablegen table for consistency and adding
and API rapper to access them.

Reviewed By: arsenm, #amdgpu

Differential Revision: https://reviews.llvm.org/D142961