[AMDGPU] Consider FLAT instructions for VMEM hazard detection (#137170)

In general, "Flat instructions look at the per-workitem address and
determine for each work item if the target memory address is in global,
private or scratch memory." (RDNA2 ISA) That means that FLAT
instructions need to be considered for VMEM hazards even without
"specific segment". Also, LDS DMA should be considered for LDS hazard
detection.

See also #137148
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README.md

The LLVM Compiler Infrastructure

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