Implement handlified String::Equals and Name::Equals.

src/v8conversions.h

Index: src/v8conversions.h
diff --git a/src/v8conversions.h b/src/v8conversions.h
index f2568c066f7dcce9284819d941e04d0e6d8c9490..61091699683559cd4ad8606108d359fe77880aab 100644
--- a/src/v8conversions.h
+++ b/src/v8conversions.h
@@ -64,14 +64,16 @@ inline uint32_t NumberToUint32(Object* number) {
 }
 
 
-// Converts a string into a double value according to ECMA-262 9.3.1
-double StringToDouble(UnicodeCache* unicode_cache,
-                      String* str,
-                      int flags,
-                      double empty_string_val = 0);
-
 // Converts a string into an integer.
-double StringToInt(UnicodeCache* unicode_cache, String* str, int radix);
+double StringToInt(UnicodeCache* unicode_cache,
+                   Vector<const uint8_t> vector,
+                   int radix);
+
+
+double StringToInt(UnicodeCache* unicode_cache,
+                   Vector<const uc16> vector,
+                   int radix);
+
 
 inline bool TryNumberToSize(Isolate* isolate,
                             Object* number, size_t* result) {