Added test case for static analysis to warn about passing uninitialized values as arguments (not the receiver) in message expressions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48845 91177308-0d34-0410-b5e6-96231b3b80d8

test/Analysis-Apple/uninit-msg-expr.m

@@ -1,6 +1,7 @@
 // RUN: clang -grsimple -verify %s
 
 #include <Foundation/NSString.h>
+#include <Foundation/NSArray.h>
 
 void f1() {
   NSString *aString;
@@ -11,3 +12,9 @@ void f2() {
   NSString *aString = nil;
   unsigned i = [aString length]; // no-warning
 }
+
+void f3() {
+  NSMutableArray *aArray = [NSArray array];
+  NSString *aString;
+  [aArray addObject:aString]; // expected-warning {{Pass-by-value argument in message expression is undefined.}}
+}