Remove MIPS support

runtime/vm/instructions_mips_test.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/instructions.h"
-#include "vm/stub_code.h"
-#include "vm/unit_test.h"
-
-namespace dart {
-
-#define __ assembler->
-
-ASSEMBLER_TEST_GENERATE(Call, assembler) {
-  __ BranchLinkPatchable(*StubCode::InvokeDartCode_entry());
-  __ Ret();
-}
-
-
-ASSEMBLER_TEST_RUN(Call, test) {
-  // The return address, which must be the address of an instruction contained
-  // in the code, points to the Ret instruction above, i.e. two instructions
-  // before the end of the code buffer, including the delay slot for the
-  // return jump.
-  uword end = test->payload_start() + test->code().Size();
-  CallPattern call(end - (2 * Instr::kInstrSize), test->code());
-  EXPECT_EQ(StubCode::InvokeDartCode_entry()->code(), call.TargetCode());
-}
-
-
-}  // namespace dart
-
-#endif  // defined TARGET_ARCH_MIPS