Fix the instruction set for dex file during (re)moving ops.

This complements https://android-review.googlesource.com/#/c/103231/
where the instruction set was mapped just for comptilation. The same
should have been done for move,remove and getSize.

The list of dex code ISAs is alo de-duped.

Bug: 16185267
Change-Id: I8fe453a800812e382e8f41b5f7922997aa9c18a9