[vm/bytecode] fixed typo in stack test

Rationale:
We should test for *empty* stack. As written, we basically
never generate OSR points for the bytecode path except for
the cases we can' handle yet :-)

#36421

Change-Id: Ie70a626f9fd24d63442e681ab120087f9d1b010b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98625
Reviewed-by: Alexander Markov <[email protected]>
Commit-Queue: Aart Bik <[email protected]>

Author: aartbik

runtime/vm/compiler/frontend/bytecode_flow_graph_builder.cc

@@ -666,9 +666,9 @@ void BytecodeFlowGraphBuilder::BuildCheckStack() {
     ASSERT(IsStackEmpty());
     code_ += B->CheckStackOverflowInPrologue(position_);
   } else {
-    // Avoid OSR points inside block-expressions.
-    // TODO(ajcbik): make sure OSR works inside BE too.
-    if (!IsStackEmpty()) {
+    // Avoid OSR points inside block-expressions with pending stack slots.
+    // TODO(ajcbik): make sure OSR works for such cases too.
+    if (IsStackEmpty()) {
       code_ += B->CheckStackOverflow(position_, loop_depth);
     }
   }