Eliminate TODO and FIXME macros

Those macros are legacy and are not used consitently throughout the
code base. This patch eliminates their definitions and rewrites
their remaining occurrences to TODO comments.

All occurrences have been checked and made sure that the comments
used a consistent style.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/vm/vm.c

@@ -287,7 +287,7 @@ vm_construct_literal_object (vm_frame_ctx_t *frame_ctx_p, /**< frame context */
 
     if (ecma_is_value_error (ret_value))
     {
-      // FIXME: throw exception instead of define an 'undefined' value.
+      /* TODO: throw exception instead of define an 'undefined' value. */
       return ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
     }
 
@@ -466,7 +466,7 @@ enum
   } \
   while (0)
 
-/* FIXME: For performance reasons, we define this as a macro.
+/* TODO: For performance reasons, we define this as a macro.
  * When we are able to construct a function with similar speed,
  * we can remove this macro. */
 #define READ_LITERAL(literal_index, target_value, target_free_op) \
@@ -649,7 +649,7 @@ vm_init_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
                                                      literal_start_p[value_index]);
           }
 
-          // FIXME: check the return value
+          /* TODO: check the return value */
           ecma_op_put_value_lex_env_base (ref_base_lex_env_p,
                                           name_p,
                                           is_strict,