[AMDGPU] Update SIInsertHardClauses for GFX11

Changes for GFX11:
- Clauses may not mix instructions of different types, and there are
  more types. For example image instructions with and without a sampler
  are now different types.
- The max size of a clause is explicitly documented as 63 instructions.
  Previously it was implicitly assumed to be 64. This is such a tiny
  difference that it does not seem worth making it conditional on the
  subtarget.
- It can be beneficial to clause stores as well as loads.

Differential Revision: https://reviews.llvm.org/D127391