[PATCH] D106298: [OpenMP] Creating the `NumTeams` and `ThreadLimit` attributes to outlined functions

[Jose Manuel Monsalve Diaz via Phabricator via cfe-commits]

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The device runtime contains several calls to __kmpc_get_hardware_num_threads_in_block
and __kmpc_get_hardware_num_blocks. If the thread_limit and the num_teams are constant,
these calls can be folded to the constant value.

In commit D106033 <https://reviews.llvm.org/D106033> we have the optimization phase. This commit adds the attributes to
the outlined function for the grid size. the two attributes are `NumTeams` and
`ThreadLimit`. These values are added as long as they are constant.

Two functions are created `getNumThreadsExprForTargetDirective` and
`getNumTeamsExprForTargetDirective`. The original functions `emitNumTeamsForTargetDirective`
 and `emitNumThreadsForTargetDirective` identify the expresion and emit the code.
However, for the Device version of the outlined function, we cannot emit anything.
Therefore, this is a first attempt to separate emision of code from deduction of the
values.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106298

Files:
  clang/lib/CodeGen/CGOpenMPRuntime.cpp
  clang/lib/CodeGen/CGOpenMPRuntime.h

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