TBR: fix build break

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 28863a6d06f6a082b5bcacfaa4a843cea8ae0b36..74249daeee3284148df1db7dddc810c87b5a74bd 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -13680,7 +13680,7 @@ RawOneByteString* OneByteString::EscapeSpecialCharacters(const String& str) {
     }
     return OneByteString::raw(dststr);
   }
-  return OneByteString::New(0, Heap::kNew);
+  return OneByteString::New(static_cast<intptr_t>(0), Heap::kNew);

[Ivan Posva, 2013/10/01 00:31:50]

Why are you not returning the canonical empty string here instead?
Symbols::Empty is your friend here.

 }
 
 RawOneByteString* ExternalOneByteString::EscapeSpecialCharacters(
@@ -13709,7 +13709,7 @@ RawOneByteString* ExternalOneByteString::EscapeSpecialCharacters(
     }
     return OneByteString::raw(dststr);
   }
-  return OneByteString::New(0, Heap::kNew);
+  return OneByteString::New(static_cast<intptr_t>(0), Heap::kNew);

[Ivan Posva, 2013/10/01 00:31:50]

ditto

 }