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[libc] make part of libc's unit test framework independent of llvm

Authored by michaelrj on Nov 16 2020, 2:20 PM.

Description

[libc] make part of libc's unit test framework independent of llvm

This is mostly changing stringref to std::string, outs() to cout,
and small supporting changes. This will make running unit tests possible
on systems that are only grabbing the libc part of llvm.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D91568

Details