Delay the variable construction in the function body. (#3289)

Local variables inside the function body should be constructed after the
parameters are initialized. Furthermore arguments should be available
during parameter initialization.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/parser/js/js-scanner.h

@@ -175,14 +175,6 @@ typedef enum
   SCANNER_FUNCTION_ARGUMENTS_NEEDED = (1 << 0), /**< arguments object needs to be created */
 } scanner_function_flags_t;
 
-/**
- * Scanner info for function statements.
- */
-typedef struct
-{
-  scanner_info_t info; /**< header */
-} scanner_function_info_t;
-
 /**
  * Option bits for scanner_create_variables function.
  */
@@ -190,6 +182,8 @@ typedef enum
 {
   SCANNER_CREATE_VARS_NO_OPTS = 0, /**< no options */
   SCANNER_CREATE_VARS_IS_EVAL = (1 << 0), /**< create variables for script / direct eval */
+  SCANNER_CREATE_VARS_IS_FUNCTION_ARGS = (1 << 1), /**< create variables for function arguments */
+  SCANNER_CREATE_VARS_IS_FUNCTION_BODY = (1 << 2), /**< create variables for function body */
 } scanner_create_variables_flags_t;
 
 /**