Noticed the "Note: Still used by emit IAS" and decided
to check if we can omit it. Saves about 3KB.

There's also the "Note: Still used by emit IAS" CFG
text header, but I haven't looked at that.

This would silently cripple the -filetype=asm or
-filetype=iasm in the MINIMAL build, but that isn't
supposed to be supported. Had to conditionalize some more
of the tests.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4080
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/952993006