When determining whether we can use "this", make sure to look through
enum contexts (along with block contexts, which we already did). Fixes
PR7196.

llvm-svn: 104444
diff --git a/clang/test/SemaCXX/class.cpp b/clang/test/SemaCXX/class.cpp
index 287f50d..b5cecbc 100644
--- a/clang/test/SemaCXX/class.cpp
+++ b/clang/test/SemaCXX/class.cpp
@@ -147,3 +147,15 @@
     ec.member = 0;
   }
 }
+
+namespace PR7196 {
+  struct A {
+    int a;
+
+    void f() {
+      char i[sizeof(a)];
+      enum { x = sizeof(i) };
+      enum { y = sizeof(a) };
+    }
+  };
+}