[Xray] logging forgotten header
[Xray] logging forgotten header

pthread.h missing for pthread_key* functions.

Reviewers: dberris

Reviewed By: dberris

Differential Revison: https://reviews.llvm.org/D47933


git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@334272 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt