There's a pop() in emit_profile_type with no corresponding push(). If we hit that pop
we will crash immediately.

This is assert-only code so we never see it in production.

#ifdef ASSERT
        {
          Label ok;
          __ ldr(rscratch1, mdo_addr);
          __ cbz(rscratch1, ok);
          __ cmp(rscratch1, TypeEntries::null_seen);
          __ br(Assembler::EQ, ok);
          // may have been set by another thread
          __ dmb(Assembler::ISHLD);
          __ mov_metadata(rscratch1, exact_klass->constant_encoding());
          __ ldr(rscratch2, mdo_addr);
          __ eor(rscratch2, rscratch1, rscratch2);
          __ andr(rscratch2, rscratch2, TypeEntries::type_mask);
          __ cbz(rscratch2, ok);

          __ stop("unexpected profiling mismatch");
          __ bind(ok);
          __ pop(tmp);
        }
#endif