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

[Matt Arsenault via llvm-commits]

================
@@ -269,11 +269,15 @@ body:            |
     S_ENDPGM 0
 ...
 
-# GCN-LABEL: name: no_hazard_lds_branch_flat
+# 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)
----------------
arsenm wrote:

Don't know why this comment is here

https://github.com/llvm/llvm-project/pull/137170