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Fixed build warning with -DLIBOMP_USE_HWLOC=1

Authored by AndreyChurbanov on Jun 3 2019, 7:21 AM.

Description

Fixed build warning with -DLIBOMP_USE_HWLOC=1

Made type of depth of hwloc object to correapond with
change from unsigned in hwloc 1,x to int in hwloc 2.x.
This eliminates the warning on signed-unsigned comparison.

Differential Revision: https://reviews.llvm.org/D62332

llvm-svn: 362401

Details