Commits on Jan 20, 2022

1. Rework VM dispatch …

   Overview:
   - `VM_OC_*` opcodes are removed, now the dispatch is based on the `CBC`/`CBC_EXT` opcode
   - The common argument decoding is removed, now each opcode resolves it's arguments individually using `VM_DECODE_{EXT}_...` macros. Whenever an argument is decoded the dispatcher continues with the same opcode increased by `VM_OPCODE_DECODED_ARG`.
   - E.g.: A opcode with 2 literal arguments dispatches as the following:
     - step_1: `case opcode: goto resolve_first_literal`, opcode increment by `VM_OPCODE_DECODED_ARG`, dispatch again (Hidden by macro)
     - step_2: `case VM_OPCODE_ONE_LITERAL(opcode): goto resolve_second_literal`, opcode increment by `VM_OPCODE_DECODED_ARG`, dispatch again (Hidden by macro)
     - step_3: `case VM_OPCODE_TWO_LITERALS (opcode):` Opcode handler implementation goes here.
     - The opcode handler implementation goes as the following:
   ```c
     case VM_OPCODE_TWO_LITERALS (opcode):
     {
       VM_DECODE_LITERAL_LITERAL (opcode);
   
      /* use left and right value as before */
     }
   ```
   - The put result block is optimized, each assignment knows whether an ident or property reference should be resolved
   - `free_left_value` and `free_both_values` labels are removed, due to the extra long jumps they caused to execute 1 or 2 simple calls.
   
   JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik robert.fancsik@h-lab.eu

   Robert Fancsik committed Jan 20, 2022
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