[analyzer] Malloc: Utter the name of the leaked variable.
Specifically, we use the last store of the leaked symbol in the leak diagnostic.
(No support for struct fields since the malloc checker doesn't track those
yet.)

+ Infrastructure to track the regions used in store evaluations.
This approach is more precise than iterating the store to
obtain the region bound to the symbol, which is used in RetainCount
checker. The region corresponds to what is uttered in the code in the
last store and we do not rely on the store implementation to support
this functionality.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153212 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/malloc-annotations.c b/test/Analysis/malloc-annotations.c
index fbc6391..a0c1452 100644
--- a/test/Analysis/malloc-annotations.c
+++ b/test/Analysis/malloc-annotations.c
@@ -26,7 +26,7 @@
 
 void f1() {
   int *p = malloc(12);
-  return; // expected-warning{{Memory is never released; potential memory leak}}
+  return; // expected-warning{{Memory is never released; potential leak}}
 }
 
 void f2() {
@@ -54,16 +54,16 @@
 
 void n2af1() {
   int *p = my_malloc2(12);
-  return; // expected-warning{{Memory is never released; potential memory leak}}
+  return; // expected-warning{{Memory is never released; potential leak}}
 }
 
 void af1() {
   int *p = my_malloc(12);
-  return; // expected-warning{{Memory is never released; potential memory leak}}
+  return; // expected-warning{{Memory is never released; potential leak}}
 }
 
 void af1_b() {
-  int *p = my_malloc(12); // expected-warning{{Memory is never released; potential memory leak}}
+  int *p = my_malloc(12); // expected-warning{{Memory is never released; potential leak}}
 }
 
 void af1_c() {