When switching buffers, the last_call_pc_ should be adjusted like
pc_, because the buffer's start address is changed.

Besides, add a missing BlockTrampolinePoolScope.

Change-Id: Iee6d9795a256e041bb2dbf7d8ca63f346a248539
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2504855Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#70823}