Daniel Thornburgh 6b92bb4790 [Support] [DebugInfo] Lazily create cache dir. ...

This change defers creating Support/Caching.cpp's cache directory until
it actually writes to the cache.

This allows using Caching library in a read-only fashion. If read-only,
the cache is guaranteed not to write to disk. This keeps tools using
DebugInfod (currently llvm-symbolizer) hermetic when not configured to
perform remote lookups.

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D117589

2022-01-20 19:27:15 +00:00

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