[PATCH] Minor tweak to MDA

[JF Bastien]

lgtm otherwise.


================
Comment at: lib/Analysis/MemoryDependenceAnalysis.cpp:426
@@ -425,2 +425,3 @@
   // Walk backwards through the basic block, looking for dependencies.
-  while (ScanIt != BB->begin()) {
+  // We can stop before processing PHIs or dbg intrinsics
+  const BasicBlock::iterator Begin(BB->getFirstNonPHIOrDbg());
----------------
Missing period.

http://reviews.llvm.org/D7624

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