Extract binary lvalue operators (#2630)

This patch substitutes all binary lvalue operators with an assigment + the corresponding binary operator.
E.g. A += (expression) is pasred as A = A + (expression).

Due to this replacement, all the related binary lvalue CBC opcodes can be removed.
Also the arithmetic related VM instructions can put their result directly onto the stack, since no more checking is needed.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

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

@@ -507,6 +507,7 @@ void lexer_construct_regexp_object (parser_context_t *context_p, bool parse_only
 bool lexer_compare_identifier_to_current (parser_context_t *context_p, const lexer_lit_location_t *right_ident_p);
 bool lexer_compare_raw_identifier_to_current (parser_context_t *context_p, const char *right_ident_p,
                                               size_t right_ident_length);
+uint8_t lexer_convert_binary_lvalue_token_to_binary (uint8_t token);
 
 /**
  * @}