Adds support for debugger API on MIPS.

runtime/vm/debugger_api_impl_test.cc

 // Copyright (c) 2012, 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 "include/dart_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/dart_api_impl.h"
 #include "vm/thread.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
-#if defined(TARGET_ARCH_IA32) ||                                               \
-    defined(TARGET_ARCH_X64) ||                                                \
-    defined(TARGET_ARCH_ARM)
-
 static bool breakpoint_hit = false;
 static int  breakpoint_hit_counter = 0;
 static Dart_Handle script_lib = NULL;
 
 static const bool verbose = true;
 
 static void LoadScript(const char* source) {
   script_lib = TestCase::LoadTestScript(source, NULL);
   EXPECT_VALID(script_lib);
 }
@@ skipping 1500 matching lines @@
   Dart_SetExceptionThrownHandler(&StackTraceDump2ExceptionHandler);
   breakpoint_hit_counter = 0;
   Dart_SetExceptionPauseInfo(kPauseOnAllExceptions);
 
   Dart_Handle retval = Invoke("main");
   EXPECT(Dart_IsError(retval));
   EXPECT(Dart_IsUnhandledExceptionError(retval));
   EXPECT_EQ(1, breakpoint_hit_counter);
 }
 
-#endif  // TARGET_ARCH_IA32 || TARGET_ARCH_X64 || TARGET_ARCH_ARM
-
 }  // namespace dart