Clean up obtuse wording of checker diagnostic of using an uninitialized value in a function call.

Fixes: <rdar://problem/8409480> “warning: Pass-by-value argument in function call is undefined” message can be improved

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113554 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/uninit-msg-expr.m b/test/Analysis/uninit-msg-expr.m
index 4061150..a8e2f1b 100644
--- a/test/Analysis/uninit-msg-expr.m
+++ b/test/Analysis/uninit-msg-expr.m
@@ -42,7 +42,7 @@
 
 unsigned f1() {
   NSString *aString;
-  return [aString length]; // expected-warning {{Receiver in message expression is a garbage value}}
+  return [aString length]; // expected-warning {{Receiver in message expression is an uninitialized value}}
 }
 
 unsigned f2() {
@@ -53,5 +53,5 @@
 void f3() {
   NSMutableArray *aArray = [NSArray array];
   NSString *aString;
-  [aArray addObject:aString]; // expected-warning {{Pass-by-value argument in message expression is undefined.}}
+  [aArray addObject:aString]; // expected-warning {{Argument in message expression is an uninitialized value}}
 }