[llvm] [AMDGPU] make AMDGPUUniformIntrinsicCombine a function pass (PR #165265)

[Pankaj Dwivedi via llvm-commits]

================
@@ -126,6 +130,8 @@ define protected amdgpu_kernel void @trivial_waterfall_ne_zero(ptr addrspace(1)
 ; PASS-CHECK-NEXT:    br label %[[WHILE:.*]]
 ; PASS-CHECK:       [[WHILE]]:
 ; PASS-CHECK-NEXT:    [[DONE:%.*]] = phi i1 [ false, %[[ENTRY]] ], [ true, %[[IF:.*]] ]
+; PASS-CHECK-NEXT:    [[BALLOT:%.*]] = tail call i64 @llvm.amdgcn.ballot.i64(i1 [[DONE]])
----------------
PankajDwivedi-25 wrote:

we have to manually increment the iterator, wherever we are calling `eraseFromParent` recursively.

https://github.com/llvm/llvm-project/pull/165265