A64: Synchronize with r18581.

test/mjsunit/regress/d8-readbuffer.js

Index: test/mjsunit/regress/d8-readbuffer.js
diff --git a/test/mjsunit/function-arguments-duplicate.js b/test/mjsunit/regress/d8-readbuffer.js
similarity index 80%
copy from test/mjsunit/function-arguments-duplicate.js
copy to test/mjsunit/regress/d8-readbuffer.js
index 80f03a106b30a7e2f984a83b9d54b2edd8fb840a..8aec02dcac5893c9e4f62da80a77332859fc4fb7 100644
--- a/test/mjsunit/function-arguments-duplicate.js
+++ b/test/mjsunit/regress/d8-readbuffer.js
@@ -25,12 +25,16 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Execises ArgumentsAccessStub::GenerateNewNonStrictSlow.
+// Test that reading a file actually returns the file's contents.
 
-function f(a, a) {
-  assertEquals(2, a);
-  assertEquals(1, arguments[0]);
-  assertEquals(2, arguments[1]);
-}
+// Env: TEST_FILE_NAME
+assertEquals("string", typeof TEST_FILE_NAME);
+
+var a = new Uint8Array(readbuffer(TEST_FILE_NAME));
 
-f(1, 2);
+// First line of this file.
+var expected = "// Copyright 2014 the V8 project authors. All rights reserved.";
+
+for (var i = 0; i < expected.length; i++) {
+  assertEquals(expected.charCodeAt(i), a[i]);
+}