Working dex2oat and oatexec

adb shell dex2oatd --dex-file=/system/framework/core.jar     --image=/system/framework/boot.oat --base=0x50000000 "'--method=Ljava/lang/System;logI(Ljava/lang/String;)V'" "'--method=Ljava/lang/System;log(CLjava/lang/String;Ljava/lang/Throwable;)V'"
adb shell dex2oatd --boot-dex-file=/system/framework/core.jar --boot=/system/framework/boot.oat --dex-file=/system/framework/art-test-dex-HelloWorld.jar --image=/system/framework/art-test-dex-HelloWorld.oat
adb shell oatexecd -Xbootclasspath:/system/framework/core.jar -Xbootimage:/system/framework/boot.oat -classpath /system/framework/art-test-dex-HelloWorld.jar -Ximage:/system/framework/art-test-dex-HelloWorld.oat HelloWorld

09-05 17:58:18.912  2385  2385 I System  : Hello, world!

Change-Id: I53e534068584f0c3a837313e4d517a0e4a7154fc
diff --git a/src/object.cc b/src/object.cc
index 5d99cb6..f92f746 100644
--- a/src/object.cc
+++ b/src/object.cc
@@ -1047,7 +1047,8 @@
 }
 
 bool String::Equals(const StringPiece& modified_utf8) const {
-  // TODO: do not assume C-string representation.
+  // TODO: do not assume C-string representation. For now DCHECK.
+  DCHECK_EQ(modified_utf8.data()[modified_utf8.size()], 0);
   return Equals(modified_utf8.data());
 }