Make breakpoints on == fire reliably

runtime/vm/stub_code_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1684 matching lines @@
 
 void StubCode::GenerateClosureCallInlineCacheStub(Assembler* assembler) {
   GenerateNArgsCheckInlineCacheStub(assembler, 1);
 }
 
 
 void StubCode::GenerateMegamorphicCallStub(Assembler* assembler) {
   GenerateNArgsCheckInlineCacheStub(assembler, 1);
 }
 
+void StubCode::GenerateBreakpointEqNullStub(Assembler* assembler) {
+  // TODO(hausner): implement this stub.
+  __ Branch(&StubCode::EqualityWithNullArgLabel());
+}
 
 void StubCode::GenerateBreakpointClosureStub(Assembler* assembler) {
   // TODO(hausner): implement this stub.
   __ Branch(&StubCode::CallClosureFunctionLabel());
 }
 
 
 //  RA: return address (Dart code).
 //  S4: Arguments descriptor array.
 void StubCode::GenerateBreakpointStaticStub(Assembler* assembler) {
@@ skipping 425 matching lines @@
   __ Bind(&done);
   __ lw(T0, Address(SP, 0 * kWordSize));
   __ lw(T1, Address(SP, 1 * kWordSize));
   __ Ret();
   __ delay_slot()->addiu(SP, SP, Immediate(2 * kWordSize));
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS