[OpenMP] Adopt std::set in HostDataToTargetMap

Authored by ye-luo on Wed, Jun 24, 9:18 AM.


[OpenMP] Adopt std::set in HostDataToTargetMap

lookupMapping took significant time due to linear complexity searching.
This is bad for offloading from multiple host threads because lookupMapping is protected by mutex.
Use std::set for logarithmic complexity searching.

Before my change.
libomptarget inclusive time 16.7 sec, exclusive time 8.6 sec.
After the change
libomptarget inclusive time 7.3 sec, exclusive time 0.4 sec.

Most of the overhead of libomptarget (exclusive time) is gone.

Reviewers: jdoerfert, grokos

Reviewed By: grokos

Subscribers: tianshilei1992, yaxunl, guansong, sstefan1

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D82264