Fix crash: handle all flat string types in regexp replace.

test/mjsunit/string-replace-with-empty.js

Index: test/mjsunit/string-replace-with-empty.js
diff --git a/test/mjsunit/string-replace-with-empty.js b/test/mjsunit/string-replace-with-empty.js
new file mode 100644
index 0000000000000000000000000000000000000000..0e1e70a1f6e7017902d539fef10530e54cc1b1ff
--- /dev/null
+++ b/test/mjsunit/string-replace-with-empty.js
@@ -0,0 +1,57 @@
+// Copyright 2010 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: --expose-externalize-string
+
+assertEquals("0123", "aa0bb1cc2dd3".replace(/[a-z]/g, ""));
+assertEquals("0123", "\u1234a0bb1cc2dd3".replace(/[\u1234a-z]/g, ""));
+
+var expected = "0123";
+var cons = "a0b1c2d3";
+for (var i = 0; i < 5; i++) {
+  expected += expected;
+  cons += cons;
+}
+assertEquals(expected, cons.replace(/[a-z]/g, ""));
+cons = "\u12340b1c2d3";
+for (var i = 0; i < 5; i++) {
+  cons += cons;
+}
+assertEquals(expected, cons.replace(/[\u1234a-z]/g, ""));
+
+cons = "a0b1c2d3";
+for (var i = 0; i < 5; i++) {
+  cons += cons;
+}
+externalizeString(cons, true/* force two-byte */);
+assertEquals(expected, cons.replace(/[a-z]/g, ""));
+cons = "\u12340b1c2d3";
+for (var i = 0; i < 5; i++) {
+  cons += cons;
+}
+externalizeString(cons);
+assertEquals(expected, cons.replace(/[\u1234a-z]/g, ""));