[es6] re-implement rest parameters via desugaring

src/ast-value-factory.h

Index: src/ast-value-factory.h
diff --git a/src/ast-value-factory.h b/src/ast-value-factory.h
index 2fee0396fd487b02ac8d4020de783abcb989c810..91d3aad505b2ee46091f9e9f046be65ef5d7783b 100644
--- a/src/ast-value-factory.h
+++ b/src/ast-value-factory.h
@@ -256,12 +256,16 @@ class AstValue : public ZoneObject {
   F(dot_module, ".module")                                                 \
   F(dot_result, ".result")                                                 \
   F(empty, "")                                                             \
+  /* TODO(@caitp): get rid of these and use Array literals. */             \
+  F(empty_array, "$createEmptyArray")                                      \
+  F(strong_empty_array, "$createStrongEmptyArray")                         \
   F(eval, "eval")                                                          \
   F(get_template_callsite, "$getTemplateCallSite")                         \
   F(initialize_const_global, "initializeConstGlobal")                      \
   F(initialize_var_global, "initializeVarGlobal")                          \
   F(is_construct_call, "_IsConstructCall")                                 \
   F(is_spec_object, "_IsSpecObject")                                       \
+  F(length, "length")                                                      \
   F(let, "let")                                                            \
   F(make_reference_error, "MakeReferenceError")                            \
   F(make_syntax_error, "MakeSyntaxError")                                  \