Factor current-span logic into a caching handle #2139
Merged
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After #2030 and while working on #1935 it became quite clear that we need to do some caching here, because some retag operations generate many calls to
log_invalidation
, and would thus search the current thread's stack many times for a local crate. This caching fixes that. This handle type also has the nice benefit of tucking away all theThreadManager
+CrateNum
logic.