Try to unbreak the polly build.

llvm-svn: 219080
diff --git a/polly/lib/Analysis/ScopDetection.cpp b/polly/lib/Analysis/ScopDetection.cpp
index e25d76e..8b1c68c 100644
--- a/polly/lib/Analysis/ScopDetection.cpp
+++ b/polly/lib/Analysis/ScopDetection.cpp
@@ -537,9 +537,10 @@
 
   // Check if the base pointer of the memory access does alias with
   // any other pointer. This cannot be handled at the moment.
-  AliasSet &AS =
-      Context.AST.getAliasSetForPointer(BaseValue, AliasAnalysis::UnknownSize,
-                                        Inst.getMetadata(LLVMContext::MD_tbaa));
+  AAMDNodes AATags;
+  Inst.getAAMetadata(AATags);
+  AliasSet &AS = Context.AST.getAliasSetForPointer(
+      BaseValue, AliasAnalysis::UnknownSize, AATags);
 
   // INVALID triggers an assertion in verifying mode, if it detects that a
   // SCoP was detected by SCoP detection and that this SCoP was invalidated by