[llvm] [AMDGPU] Limit promoting allocas that have users with dynamic index above a threshold on number of elements (PR #170327)

[Carl Ritson via llvm-commits]

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@@ -920,6 +926,23 @@ bool AMDGPUPromoteAllocaImpl::tryPromoteAllocaToVector(AllocaInst &Alloca) {
       if (!Index)
         return RejectUser(Inst, "cannot compute vector index for GEP");
 
+      if (!isa<ConstantInt>(Index)) {
+        bool UsedInLoad = false;
+        for (auto *U : GEP->users()) {
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perlfu wrote:

Can use `any_of()` here.

https://github.com/llvm/llvm-project/pull/170327