Add support for two byte strings in direct call to RegExp

The stub for calling RegExp directly now also handles two byte strings.

Support for flat cons strings added for both ascii and two byte.

Some code code simplifications and added a few constants.
Review URL: http://codereview.chromium.org/545151

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3678 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.h

@@ -3649,6 +3649,8 @@ class JSRegExp: public JSObject {
       FixedArray::kHeaderSize + kTagIndex * kPointerSize;
   static const int kDataAsciiCodeOffset =
       FixedArray::kHeaderSize + kIrregexpASCIICodeIndex * kPointerSize;
+  static const int kDataUC16CodeOffset =
+      FixedArray::kHeaderSize + kIrregexpUC16CodeIndex * kPointerSize;
   static const int kIrregexpCaptureCountOffset =
       FixedArray::kHeaderSize + kIrregexpCaptureCountIndex * kPointerSize;
 };

src/regexp-macro-assembler.cc

@@ -122,7 +122,10 @@ NativeRegExpMacroAssembler::Result NativeRegExpMacroAssembler::Match(
 
   bool is_ascii = subject->IsAsciiRepresentation();
 
+  // The string has been flattened, so it it is a cons string it contains the
+  // full string in the first part.
   if (StringShape(subject_ptr).IsCons()) {
+    ASSERT_EQ(0, ConsString::cast(subject_ptr)->second()->length());
     subject_ptr = ConsString::cast(subject_ptr)->first();
   }
   // Ensure that an underlying string has the same ascii-ness.