[PATCH] Merge metadata in the AliasSetTracker (and refactor merging)

[Philip Reames]

================
Comment at: include/llvm/IR/Metadata.h:549
@@ -548,1 +548,3 @@
 
+  void merge(const AAMDNodes &N);
+
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Documentation?  

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Comment at: lib/Analysis/TypeBasedAliasAnalysis.cpp:626
@@ -625,1 +625,3 @@
 
+void AAMDNodes::merge(const AAMDNodes &N) {
+  TBAA = MDNode::getMostGenericTBAA(TBAA, N.TBAA);
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Given the implementation, I'd be tempted to have this return a new merged AAMDNodes structure. e.g.
AAMDNodes merge(const AAMDNodes &LHS, const AAMDNodes& RHS) { .. }

http://reviews.llvm.org/D9396

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