Fix crash in optimized code caused by missing IC data.

runtime/vm/intrinsifier_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1462 matching lines @@
 }
 
 
 bool Intrinsifier::String_getIsEmpty(Assembler* assembler) {
   __ ldr(R0, Address(SP, 0 * kWordSize));
   __ ldr(R0, FieldAddress(R0, String::length_offset()));
   __ cmp(R0, ShifterOperand(Smi::RawValue(0)));
   __ LoadObject(R0, Bool::True(), EQ);
   __ LoadObject(R0, Bool::False(), NE);
   __ Ret();
-  return true;
+  return false;

[srdjan, 2013/08/23 14:54:04]

Please add a comment why we need to generate 'slow' path. Ditto for other
architectures.

 }
 
 
 bool Intrinsifier::OneByteString_getHashCode(Assembler* assembler) {
   __ ldr(R1, Address(SP, 0 * kWordSize));
   __ ldr(R0, FieldAddress(R1, String::hash_offset()));
   __ cmp(R0, ShifterOperand(0));
   __ bx(LR, NE);  // Return if already computed.
 
   __ ldr(R2, FieldAddress(R1, String::length_offset()));
@@ skipping 203 matching lines @@
   __ Bind(&ok);
   __ Ret();
 
   __ Bind(&fall_through);
   return false;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM