[llvm] Fix crash from [CGData] Global Merge Functions (#112671) (PR #116241)

[Vincent Lee via llvm-commits]

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@@ -666,7 +666,6 @@ bool GlobalMergeFuncPassWrapper::runOnModule(Module &M) {
 
 PreservedAnalyses GlobalMergeFuncPass::run(Module &M,
                                            AnalysisManager<Module> &AM) {
-  ModuleSummaryIndex *Index = &(AM.getResult<ModuleSummaryIndexAnalysis>(M));
-  bool Changed = GlobalMergeFunc(Index).run(M);
+  bool Changed = GlobalMergeFunc(ImportSummary).run(M);
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thevinster wrote:

If GlobalMergeFunc doesn't need ModuleSummaryIndex, why not just initialize without the parameter? Is there some weird side effect from some other thing that requires passing it in even though it's not used? 

https://github.com/llvm/llvm-project/pull/116241