A couple of other "stack overflow" vs. "has_pending_exception()" issues in debugger fixed.

src/runtime/runtime-debug.cc

Index: src/runtime/runtime-debug.cc
diff --git a/src/runtime/runtime-debug.cc b/src/runtime/runtime-debug.cc
index 5baa151488f1e03cdf16026751ac31c09cd86b6d..8ddc494428f9726df604c0c4808e5666b1cf6c28 100644
--- a/src/runtime/runtime-debug.cc
+++ b/src/runtime/runtime-debug.cc
@@ -3022,6 +3022,11 @@ RUNTIME_FUNCTION(Runtime_ExecuteInDebugContext) {
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
 
   DebugScope debug_scope(isolate->debug());
+  if (debug_scope.failed()) {
+    DCHECK(isolate->has_pending_exception());
+    return isolate->heap()->exception();
+  }
+
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
@@ -3037,6 +3042,10 @@ RUNTIME_FUNCTION(Runtime_GetDebugContext) {
   Handle<Context> context;
   {
     DebugScope debug_scope(isolate->debug());
+    if (debug_scope.failed()) {
+      DCHECK(isolate->has_pending_exception());
+      return isolate->heap()->exception();
+    }
     context = isolate->debug()->GetDebugContext();
   }
   if (context.is_null()) return isolate->heap()->undefined_value();