[llvm] [AMDGPU] Make LowerModuleLDS a noop on an already lowered module (PR #217075)

[Arseniy Obolenskiy via llvm-commits]

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@@ -1078,11 +1078,16 @@ class AMDGPULowerModuleLDS {
   }
 
   bool runOnModuleNormal(Module &M) {
-    CallGraph CG = CallGraph(M);
     bool Changed = superAlignLDSGlobals(M);
 
-    Changed |=
-        eliminateGVConstantExprUsesFromAllInstructions(M, isLDSVariableToLower);
+    // Nothing left to lower on the codegen-partition rerun.
+    if (none_of(M.globals(), isNotYetLoweredLDSVariable))
+      return Changed;
+
+    CallGraph CG = CallGraph(M);
+
+    Changed |= eliminateGVConstantExprUsesFromAllInstructions(
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aobolensk wrote:

Done, unconditionally returning true now 

https://github.com/llvm/llvm-project/pull/217075