Reland regexp global optimizations.

test/cctest/test-strings.cc

Index: test/cctest/test-strings.cc
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index c4f72f47010342fedc3c2fd4e042faf0fe649a1a..4557100e7ab1d1ec288d1135d0986ffb8264093c 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -1,4 +1,4 @@
-// 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
@@ -691,3 +691,20 @@ TEST(RegExpOverflow) {
   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));
+}