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[XRay] [compiler-rt] make sure single threaded programs get traced too

Description

[XRay] [compiler-rt] make sure single threaded programs get traced too

Summary:
When the XRay user calls the API to finish writing the log, the thread
which is calling the API still hasn't finished and therefore won't get
its trace written. Add a test for only the main thread to check this.

Reviewers: dberris

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D38493

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