Introduce parser-time optimization that moves function's argument values to registers.

For functions with the optimization applied:
 - vm puts arguments values immediately to registers without putting them to variables in lexical environment;
 - number of arguments is extracted from corresponding 'reg_var_decl' instruction's argument;
 - for functions that also don't have local variables, lexical environments are not created.

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

jerry-core/parser/js/serializer.cpp

@@ -34,18 +34,6 @@ serializer_get_op_meta (vm_instr_counter_t oc)
   return scopes_tree_op_meta (current_scope, oc);
 }
 
-/**
- * Get variable declaration of the current scope
- *
- * @return variable declaration instruction
- */
-op_meta
-serializer_get_var_decl (vm_instr_counter_t oc) /**< index of variable declaration */
-{
-  JERRY_ASSERT (current_scope);
-  return scopes_tree_var_decl (current_scope, oc);
-} /* serializer_get_var_decl */
-
 /**
  * Get byte-code instruction from current scope, or specified byte-code array
  *
@@ -231,17 +219,6 @@ serializer_get_current_instr_counter (void)
   return scopes_tree_instrs_num (current_scope);
 }
 
-/**
- * Get number of variable declarations in the current scope
- *
- * @return count of variable declarations
- */
-vm_instr_counter_t
-serializer_get_current_var_decls_counter (void)
-{
-  return scopes_tree_var_decls_num (current_scope);
-} /* serializer_get_current_var_decls_counter */
-
 vm_instr_counter_t
 serializer_count_instrs_in_subscopes (void)
 {