[libc] add simplified tid cache (#101620) According to discussions on monthly meeting, we probably don't want to cache `getpid` anymore. glibc removes their cache. bionic is hesitating whether such cache is to be removed. `getpid` is async-signal-safe, so we must make sure it always work. However, for `gettid`, we have more freedom. Moreover, we are using `gettid` to examine deadlock such that the performance penalty is not negligible here. Thus, this patch is separated from previous patch to provide only `tid` caching. It is much more simplified. Hopefully, previous build issues can be resolved easily.
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