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[OpenMP] Adding GOMP compatible cancellation

Description

[OpenMP] Adding GOMP compatible cancellation

Remove fatal error messages from the cancellation API for GOMP
Add __kmp_barrier_gomp_cancel() to implement cancellation of parallel regions.
This new function uses the linear barrier algorithm with a cancellable
nonsleepable wait loop.

Differential Revision: https://reviews.llvm.org/D57969

Details

Committed
jlpeytonFeb 19 2019, 10:47 AM
Differential Revision
D57969: [OpenMP] Adding GOMP compatible cancellation
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