Remove buggy code introduced by 8249451

if ((thread->has_pending_exception() || thread->frames_to_pop_failed_realloc() > 0) && exec_mode != Unpack_uncommon_trap) {
    assert(thread->has_pending_exception(), "should have thrown OOME/Async");

introduced a buggy code checking, clearing pending exception and taking Unpack_exception route.

This can have consequences as the deopt entries may have additional logic depending on bcis