Standardize accesses to the TargetInfo in IR-gen.

Patch by Stephen Lin!

llvm-svn: 179638
diff --git a/clang/lib/CodeGen/CGAtomic.cpp b/clang/lib/CodeGen/CGAtomic.cpp
index 24c930f..0b48a5c 100644
--- a/clang/lib/CodeGen/CGAtomic.cpp
+++ b/clang/lib/CodeGen/CGAtomic.cpp
@@ -327,7 +327,7 @@
   CharUnits alignChars = getContext().getTypeAlignInChars(AtomicTy);
   unsigned Align = alignChars.getQuantity();
   unsigned MaxInlineWidthInBits =
-    getContext().getTargetInfo().getMaxAtomicInlineWidth();
+    getTarget().getMaxAtomicInlineWidth();
   bool UseLibcall = (Size != Align ||
                      getContext().toBits(sizeChars) > MaxInlineWidthInBits);