[PATCH] Correctly combine alias.scope metadata by a union instead of intersecting

[hfinkel at anl.gov]

Ack, you're right. Thanks for catching that. LGTM.


================
Comment at: lib/Analysis/TypeBasedAliasAnalysis.cpp:627
@@ -626,3 +626,3 @@
     N.Scope =
-        MDNode::intersect(N.Scope, getMetadata(LLVMContext::MD_alias_scope));
+        MDNode::getMostGenericAliasScope(N.Scope, getMetadata(LLVMContext::MD_alias_scope));
   else
----------------
Line too long?

http://reviews.llvm.org/D7490

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