Make breakpoints on == fire reliably

runtime/vm/stub_code_arm.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_ARM)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1534 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());
 }
 
 
 //  LR: return address (Dart code).
 //  R4: arguments descriptor array.
 void StubCode::GenerateBreakpointStaticStub(Assembler* assembler) {
   // Create a stub frame as we are pushing some objects on the stack before
@@ skipping 376 matching lines @@
   __ Bind(&reference_compare);
   __ cmp(left, ShifterOperand(right));
   __ Bind(&done);
   __ PopList((1 << R0) | (1 << R1) | (1 << R2));
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM