[llvm] [AMDGPU] Folding imm offset in more cases for scratch access (PR #70634)

[via llvm-commits]

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@@ -4486,14 +4494,67 @@ bool AMDGPUInstructionSelector::isDSOffset2Legal(Register Base, int64_t Offset0,
   return KB->signBitIsZero(Base);
 }
 
+// Whether we can infer the operands are non-negative if the result is
+// non-negative.
+bool canInferNonNegativeOperands(MachineInstr *Addr) {
+  return Addr->getOpcode() == TargetOpcode::G_OR ||
+         (Addr->getOpcode() == TargetOpcode::G_PTR_ADD &&
+          Addr->getFlag(MachineInstr::NoUWrap));
+};
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ruiling wrote:

Maybe just `isNoUnsignedWrap`?

https://github.com/llvm/llvm-project/pull/70634