Bugfix: HCheckInstanceType::GetCheckMaskAndTag used an incorrect mask.

The mask to check for an internalized string was incorrectly formed. Hat
tip to Weiliang Lin for discovering the bug.

BUG=v8:3038
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/108033002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18265 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.cc

@@ -1533,7 +1533,7 @@ void HCheckInstanceType::GetCheckMaskAndTag(uint8_t* mask, uint8_t* tag) {
       *tag = kStringTag;
       return;
     case IS_INTERNALIZED_STRING:
-      *mask = kIsNotInternalizedMask;
+      *mask = kIsNotStringMask | kIsNotInternalizedMask;
       *tag = kInternalizedTag;
       return;
     default:

test/mjsunit/regress/internalized-string-not-equal.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+
+// A bug in r15773, when masks for internalized string and string types
+// were reorganized.
+function equal(o1, o2) {
+  return (o1 == o2);
+}
+var a = "abc";
+var b = "abc";
+equal(a, b);
+equal(a, b);
+%OptimizeFunctionOnNextCall(equal);
+assertTrue(equal(1.3, 1.3));