[vm/simdbc] Clean up slot for result in InlineCacheMiss

This is the fix
dart-lang/sdk@22b4ec0
ported from kernel bytecode interpreter to DBC simulator.

Change-Id: I36df3485219d8ba19eea86d1aa94ea24fe4f69d2
Reviewed-on: https://dart-review.googlesource.com/c/80503
Auto-Submit: Alexander Markov <[email protected]>
Reviewed-by: Régis Crelier <[email protected]>
Commit-Queue: Régis Crelier <[email protected]>

Author: alexmarkov

runtime/vm/simulator_dbc.cc

@@ -812,6 +812,7 @@ void Simulator::InlineCacheMiss(int checked_args,
                                 RawObject** FP,
                                 RawObject** SP) {
   RawObject** result = top;
+  top[0] = 0;  // Clean up result slot.
   RawObject** miss_handler_args = top + 1;
   for (intptr_t i = 0; i < checked_args; i++) {
     miss_handler_args[i] = args[i];