Delete obsolete debug stub

runtime/vm/stub_code_ia32.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_IA32)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1871 matching lines @@
   // ensures that the call target is compiled.
   // Note that we can't just jump to the CallStatic function stub
   // here since that stub would patch the call site with the
   // static function address.
   __ movl(ECX, FieldAddress(EAX, Code::instructions_offset()));
   __ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(ECX);
 }
 
 
-//  TOS(0): return address (Dart code).
-void StubCode::GenerateBreakpointReturnStub(Assembler* assembler) {
-  // Create a stub frame as we are pushing some objects on the stack before
-  // calling into the runtime.
-  __ EnterStubFrame();
-  __ pushl(EAX);
-  __ CallRuntime(kBreakpointReturnHandlerRuntimeEntry, 0);
-  __ popl(EAX);
-  __ LeaveFrame();
-
-  // Instead of returning to the patched Dart function, emulate the
-  // smashed return code pattern and return to the function's caller.
-  __ popl(ECX);  // Discard return address to patched dart code.
-  // Execute function epilog code that was smashed in the Dart code.
-  __ LeaveFrame();
-  __ ret();
-}
-
-
 //  ECX: Inline cache data array.
 //  TOS(0): return address (Dart code).
 void StubCode::GenerateBreakpointDynamicStub(Assembler* assembler) {
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   __ EnterStubFrame();
   __ pushl(ECX);
   __ CallRuntime(kBreakpointDynamicHandlerRuntimeEntry, 0);
   __ popl(ECX);
   __ LeaveFrame();
@@ skipping 306 matching lines @@
   const Register temp = ECX;
   __ movl(left, Address(ESP, 2 * kWordSize));
   __ movl(right, Address(ESP, 1 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32