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[OpenMP][OMPIRBuilder] Add Directives (master and critical) to OMPBuilder.

Authored by fady <fady@LAP118789.ornl.gov> on Feb 8 2020, 4:54 PM.

Description

[OpenMP][OMPIRBuilder] Add Directives (master and critical) to OMPBuilder.

Add support for Master and Critical directive in the OMPIRBuilder. Both make use of a new common interface for emitting inlined OMP regions called emitInlinedRegion which was added in this patch as well.

Also this patch modifies clang to use the new directives when -fopenmp-enable-irbuilder commandline option is passed.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D72304