[regexp] Port remaining JS functions in regexp.js

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index c7a4eaea716597693abb9d1060be98a38066b59d..27cb0130a2f447ce1587afafdbdd899495670648 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -51,6 +51,10 @@ enum ContextLookupFlags {
   V(OBJECT_IS_FROZEN, JSFunction, object_is_frozen)                     \
   V(OBJECT_IS_SEALED, JSFunction, object_is_sealed)                     \
   V(OBJECT_KEYS, JSFunction, object_keys)                               \
+  V(REGEXP_INITIALIZE, JSFunction, regexp_initialize)                   \
+  V(REGEXP_INTERNAL_MATCH, JSFunction, regexp_internal_match)           \
+  V(REGEXP_INTERNAL_REPLACE, JSFunction, regexp_internal_replace)       \
+  V(REGEXP_IS_REGEXP, JSFunction, regexp_is_regexp)                     \
   V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply)                     \
   V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct)             \
   V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \