Fix unoptimized code calling a disabled code when --verify-on-transition is enabled.

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 2005 matching lines @@
 void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) {
   __ Comment("OptimizeFunctionStub");
   __ EnterStubFrame();
   __ addiu(SP, SP, Immediate(-3 * kWordSize));
   __ sw(S4, Address(SP, 2 * kWordSize));
   // Setup space on stack for return value.
   __ sw(ZR, Address(SP, 1 * kWordSize));
   __ sw(T0, Address(SP, 0 * kWordSize));
   __ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
   __ Comment("OptimizeFunctionStub return");
-  __ lw(CODE_REG, Address(SP, 1 * kWordSize));  // Get Code object
+  __ lw(T0, Address(SP, 1 * kWordSize));  // Get Function object
   __ lw(S4, Address(SP, 2 * kWordSize));  // Restore argument descriptor.
   __ addiu(SP, SP, Immediate(3 * kWordSize));  // Discard argument.
 
-  __ lw(T0, FieldAddress(CODE_REG, Code::entry_point_offset()));
-  __ LeaveStubFrameAndReturn(T0);
+  __ lw(CODE_REG, FieldAddress(T0, Function::code_offset()));
+  __ lw(T1, FieldAddress(T0, Function::entry_point_offset()));
+  __ LeaveStubFrameAndReturn(T1);
   __ break_(0);
 }
 
 
 // Does identical check (object references are equal or not equal) with special
 // checks for boxed numbers.
 // Returns: CMPRES1 is zero if equal, non-zero otherwise.
 // Note: A Mint cannot contain a value that would fit in Smi, a Bigint
 // cannot contain a value that fits in Mint or Smi.
 static void GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
@@ skipping 348 matching lines @@
 }
 
 
 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
   __ break_(0);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS