Expect added members for instrumented modules

hiddenapi expects that all members in a class to have corresponding hidden
API flags. However, this can't be satisfied when the java module having
the class is instrumented; JaCoCo added a few number of synthetic
members. In this case, give 'no-force-assign-all' option to the hidden
api tool so that it doesn't complain about the synthetic methods.

Also, disabling instrumenting jacocoagent itself, because it doesn't
make sense.

Exempt-From-Owner-Approval: PS3 fixes a typo in a comment. PS2 got ORV.

Bug: 149353192
Test: SKIP_ABI_CHECKS=true EMMA_INSTRUMENT=true
EMMA_INSTRUMENT_FRAMEWORK=true SKIP_BOOT_JARS_CHECK=true m
out/soong/.intermediates/external/apache-xml/apache-xml/android_common_com.android.art.debug/hiddenapi/unaligned/unaligned.jar
Change-Id: Ibaf383c439945ab664e885af319548b56e2c8cb6