Rename "string/overflow.dart" -> "string/overflow_test.dart".

Change-Id: I32fa46c5750ee6d2410231322bf16fa7decb751d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/201227
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
Commit-Queue: Bob Nystrom <rnystrom@google.com>

Author: munificent

tests/language/string/overflow.dart …sts/standalone/string_overflow_test.darttests/language/string/overflow.dart renamed to tests/standalone/string_overflow_test.dart tests/language/string/overflow.dart renamed to tests/standalone/string_overflow_test.dart

@@ -11,11 +11,6 @@ main() {
   String a = "a";
   for (; a.length < 256 * 1024 * 1024;) a = a + a;
 
-  var exception_thrown = false;
-  try {
-    var concat = "$a$a$a$a$a$a$a$a";
-  } on OutOfMemoryError catch (exc) {
-    exception_thrown = true;
-  }
-  Expect.isTrue(exception_thrown);
+  var concat = "$a$a$a$a$a$a$a$a";
+  Expect.equals(concat.length, 2147483648);
 }

tests/language_2/string/overflow.dart …s/standalone_2/string_overflow_test.darttests/language_2/string/overflow.dart renamed to tests/standalone_2/string_overflow_test.dart tests/language_2/string/overflow.dart renamed to tests/standalone_2/string_overflow_test.dart

@@ -13,11 +13,6 @@ main() {
   String a = "a";
   for (; a.length < 256 * 1024 * 1024;) a = a + a;
 
-  var exception_thrown = false;
-  try {
-    var concat = "$a$a$a$a$a$a$a$a";
-  } on OutOfMemoryError catch (exc) {
-    exception_thrown = true;
-  }
-  Expect.isTrue(exception_thrown);
+  var concat = "$a$a$a$a$a$a$a$a";
+  Expect.equals(concat.length, 2147483648);
 }