[mips][interpreter] Encode BytecodeSizes as uint8_t for better cache locality

Port: 3965dcd5

Change-Id: I84064ebcffde490a44a341f0e65a3715746ca693
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2658655


Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#72419}