Replace "can not" with "cannot" in diagnostics messages.

llvm-svn: 203302
diff --git a/clang/test/SemaObjCXX/exceptions-fragile.mm b/clang/test/SemaObjCXX/exceptions-fragile.mm
index 54d9f83..ff5a0cb 100644
--- a/clang/test/SemaObjCXX/exceptions-fragile.mm
+++ b/clang/test/SemaObjCXX/exceptions-fragile.mm
@@ -6,7 +6,7 @@
 namespace test0 {
   void test() {
     try {
-    } catch (NSException *e) { // expected-warning {{can not catch an exception thrown with @throw in C++ in the non-unified exception model}}
+    } catch (NSException *e) { // expected-warning {{cannot catch an exception thrown with @throw in C++ in the non-unified exception model}}
     }
   }
 }