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[Reproducers] Add more logging to reproducer instrumentation

Authored by JDevlieghere on Feb 27 2019, 8:40 AM.

Description

[Reproducers] Add more logging to reproducer instrumentation

Debugging issues with instrumentation capture and replay can be
particularly tricky, especially because part of the process takes places
even before the debugger is initialized. This patch adds more logging
capabilities to these classes, hidden behind a macro define.

Differential revision: https://reviews.llvm.org/D58566

llvm-svn: 355002