[llvm] [NFC][AMDGPU] Add some debug prints to SIMemoryLegalizer (PR #190658)

[Matt Arsenault via llvm-commits]

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@@ -91,6 +92,47 @@ enum class SIAtomicAddrSpace {
   LLVM_MARK_AS_BITMASK_ENUM(/* LargestFlag = */ ALL)
 };
 
+#ifndef NDEBUG
+static const char *scopeToString(SIAtomicScope S) {
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arsenm wrote:

StringRef 

https://github.com/llvm/llvm-project/pull/190658