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[Support][Test] Time profiler: add regression test

Description

[Support][Test] Time profiler: add regression test

Summary:
Add output to llvm::errs() when -ftime-trace option is enabled,
add regression test checking this option works as expected.

Reviewers: thakis, aganea

Subscribers: cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D61914