Don't abort on unrecognized arguments.

As art development progresses, it's natural that art
will support command line args that dalvik doesn't.
Adding no-op support for all art flags in dalvik or
adding dalvik specific switches in dalvikvm.cc or
frameworks/base seem like a waste of time.

Makes dalvik usable again on master. (Currently
fails to start due to -Xprofile flags.)

Change-Id: I2faca36df41d8b1efb60fb6ed0a8412d957791a4
Add native binding for isDexOptNeededInternal.

Dalvik has no profiler, so we can safely ignore the
"defer" argument.

Keeps dalvik functional on master.

Change-Id: I2ace9a215e7ff471294927aa870e55cf7c0327b1