ART: Fix HSelectGenerator for instructions which can throw.

Make sure that HSelectGenerator doesn't hoist instructions which
can throw. Currently this doesn't happen due to
SideEffect::CanTriggerGC however this side effect is to be removed
for some instructions.

Test: select_generator_test.
Test: test-art-host, test-art-target.

Change-Id: I996f6cbdcee4987a36079d387a7b74b326881ab6