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[XRay] Fix enter function tracing for record unwriting

Authored by dberris on Nov 8 2018, 10:49 PM.

Description

[XRay] Fix enter function tracing for record unwriting

Summary:
Before this change, we could run into a situation where we may try to
undo tail exit records after writing metadata records before a function
enter event. This change rectifies that by resetting the tail exit
counter after writing the metadata records.

Reviewers: mboerger

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D54292

llvm-svn: 346475

Details