Remove unreachable catch entries in GenSpecialCase().
Remove unreachable catch entries in GenSpecialCase().

Fix debug build CHECK failure when we generate special
method implementation and drop unreachable catch handlers.

Bug: 13164331
Change-Id: I00e9841a2db8acaf1e81e1d9702e155c5b7e72e2

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst