Allow setting debugger breakpoints on CompareNilICs

test/cctest/test-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1072 matching lines @@
   CheckDebugBreakFunction(
       &env,
       "function f5(){var index='propertyName'; var a={}; return a[index];}",
       "f5",
       0,
       v8::internal::RelocInfo::CODE_TARGET,
       Isolate::Current()->builtins()->builtin(
           Builtins::kKeyedLoadIC_DebugBreak));
 #endif
 
+  CheckDebugBreakFunction(
+      &env,
+      "function f6(a){return a==null;}",
+      "f6",
+      0,
+      v8::internal::RelocInfo::CODE_TARGET,
+      Isolate::Current()->builtins()->builtin(
+          Builtins::kCompareNilIC_DebugBreak));
+
   // Check the debug break code stubs for call ICs with different number of
   // parameters.
   Handle<Code> debug_break_0 = v8::internal::ComputeCallDebugBreak(0);
   Handle<Code> debug_break_1 = v8::internal::ComputeCallDebugBreak(1);
   Handle<Code> debug_break_4 = v8::internal::ComputeCallDebugBreak(4);
 
   CheckDebugBreakFunction(&env,
                           "function f4_0(){x();}", "f4_0",
                           0,
                           v8::internal::RelocInfo::CODE_TARGET_CONTEXT,
@@ skipping 6428 matching lines @@
 TEST(LiveEditDisabled) {
   v8::internal::FLAG_allow_natives_syntax = true;
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   v8::Debug::SetLiveEditEnabled(false);
   CompileRun("%LiveEditCompareStrings('', '')");
 }
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT