Serge Pavlov 032ed39def [Support] Class to facilitate file locking ...

This change define RAII class `FileLocker` and methods `lock` and
`tryLockFor` of the class `raw_fd_stream` to facilitate using file locks.

Differential Revision: https://reviews.llvm.org/D79066

2020-07-30 13:42:20 +07:00

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