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

src/runtime/runtime-debug.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug.h"
@@ skipping 3004 matching lines @@
 
 // Calls specified function with or without entering the debugger.
 // This is used in unit tests to run code as if debugger is entered or simply
 // to have a stack with C++ frame in the middle.
 RUNTIME_FUNCTION(Runtime_ExecuteInDebugContext) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   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,
       Execution::Call(isolate, function, handle(function->global_proxy()), 0,
                       NULL));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetDebugContext) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   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();
   context->set_security_token(isolate->native_context()->security_token());
   return context->global_proxy();
 }
 
 
 // Performs a GC.
 // Presently, it only does a full GC.
@@ skipping 138 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8