Reland regexp global optimizations.

test/cctest/test-strings.cc

-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 
 // Check that we can traverse very deep stacks of ConsStrings using
 // StringInputBuffer.  Check that Get(int) works on very deep stacks
 // of ConsStrings.  These operations may not be very fast, but they
 // should be possible without getting errors due to too deep recursion.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
@@ skipping 672 matching lines @@
   v8::V8::IgnoreOutOfMemoryException();
   v8::Local<v8::Value> result = CompileRun(
       "var a = 'a';                     "
       "for (var i = 0; i < 16; i++) {   "
       "  a += a;                        "
       "}                                "
       "a.replace(/a/g, a);              ");
   CHECK(result.IsEmpty());
   CHECK(context->HasOutOfMemoryException());
 }
+
+
+TEST(StringReplaceAtomTwoByteResult) {
+  InitializeVM();
+  HandleScope scope;
+  LocalContext context;
+  v8::Local<v8::Value> result = CompileRun(
+      "var subject = 'ascii~only~string~'; "
+      "var replace = '\x80';            "
+      "subject.replace(/~/g, replace);  ");
+  CHECK(result->IsString());
+  Handle<String> string = v8::Utils::OpenHandle(v8::String::Cast(*result));
+  CHECK(string->IsSeqTwoByteString());
+
+  v8::Local<v8::String> expected = v8_str("ascii\x80only\x80string\x80");
+  CHECK(expected->Equals(result));
+}