Plumb useAA through TargetTransformInfo to remove Transforms->CodeGen header dependency

Thanks to echristo for the pointers on direction.

llvm-svn: 328737
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index c04cff9..4854a26 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -4314,8 +4314,7 @@
     if (SunkAddr->getType() != Addr->getType())
       SunkAddr = Builder.CreatePointerCast(SunkAddr, Addr->getType());
   } else if (AddrSinkUsingGEPs ||
-             (!AddrSinkUsingGEPs.getNumOccurrences() && TM &&
-              SubtargetInfo->useAA())) {
+             (!AddrSinkUsingGEPs.getNumOccurrences() && TM && TTI->useAA())) {
     // By default, we use the GEP-based method when AA is used later. This
     // prevents new inttoptr/ptrtoint pairs from degrading AA capabilities.
     DEBUG(dbgs() << "CGP: SINKING nonlocal addrmode: " << AddrMode << " for "