Fix crash in optimized code caused by missing IC data.

runtime/vm/intrinsifier_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"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1540 matching lines @@
 
   __ lw(T0, Address(SP, 0 * kWordSize));
   __ lw(T0, FieldAddress(T0, String::length_offset()));
 
   __ beq(T0, ZR, &is_true);
   __ LoadObject(V0, Bool::False());
   __ Ret();
   __ Bind(&is_true);
   __ LoadObject(V0, Bool::True());
   __ Ret();
-  return true;
+  return false;
 }
 
 
 bool Intrinsifier::OneByteString_getHashCode(Assembler* assembler) {
   Label no_hash;
 
   __ lw(T1, Address(SP, 0 * kWordSize));
   __ lw(V0, FieldAddress(T1, String::hash_offset()));
   __ beq(V0, ZR, &no_hash);
   __ Ret();  // Return if already computed.
@@ skipping 208 matching lines @@
   __ Bind(&ok);
   __ Ret();
 
   __ Bind(&fall_through);
   return false;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS