Implement logical assignment operators (#4834)

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik robert.fancsik@h-lab.eu

jerry-core/vm/vm.c

@@ -3331,6 +3331,14 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
           continue;
         }
 #if JERRY_ESNEXT
+        case VM_OC_POP_REFERENCE:
+        {
+          ecma_free_value (stack_top_p[-2]);
+          ecma_free_value (stack_top_p[-3]);
+          stack_top_p[-3] = stack_top_p[-1];
+          stack_top_p -= 2;
+          continue;
+        }
         case VM_OC_BRANCH_IF_NULLISH:
         {
           left_value = stack_top_p[-1];

jerry-core/vm/vm.h

@@ -166,6 +166,7 @@ typedef enum
   VM_OC_JUMP, /**< jump */
 #if JERRY_ESNEXT
   VM_OC_BRANCH_IF_NULLISH, /** branch if undefined or null */
+  VM_OC_POP_REFERENCE, /** prop identifier or property reference from the stack */
 #endif /* JERRY_ESNEXT */
   VM_OC_BRANCH_IF_STRICT_EQUAL, /**< branch if strict equal */
 
@@ -325,6 +326,7 @@ typedef enum
 #if !JERRY_ESNEXT
   VM_OC_EXP = VM_OC_NONE, /**< exponentiation */
   VM_OC_BRANCH_IF_NULLISH = VM_OC_NONE, /** branch if undefined or null */
+  VM_OC_POP_REFERENCE = VM_OC_NONE, /** prop identifier or property reference from the stack */
 #endif /* !JERRY_ESNEXT */
 #if !JERRY_DEBUGGER
   VM_OC_BREAKPOINT_ENABLED = VM_OC_NONE, /**< enabled breakpoint for debugger is unused */