Rename static analyzer namespace 'GR' to 'ento'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122492 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/GR/MemRegion.cpp b/lib/GR/MemRegion.cpp
index fd8ab6a..f162236 100644
--- a/lib/GR/MemRegion.cpp
+++ b/lib/GR/MemRegion.cpp
@@ -22,7 +22,7 @@
 #include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
-using namespace GR;
+using namespace ento;
 
 //===----------------------------------------------------------------------===//
 // MemRegion Construction.