To help debug a suspect crash in these functions.
Also, change some of the counter checks to use more
Objective-C style checks instead of std::find.
Bug: dawn:1102
Change-Id: I693d1f2489116200b2c0608ca60bc3eb8ddb8571
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/71242
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Hao Li <hao.x.li@intel.com>
Commit-Queue: Austin Eng <enga@chromium.org>