[llvm] [OpenMPIRBuilder] Add ThreadLimit and NumTeamsUpper clauses to teams clause (PR #68364)

[Kiran Chandramohan via llvm-commits]

================
@@ -1917,8 +1917,13 @@ class OpenMPIRBuilder {
   ///
   /// \param Loc The location where the teams construct was encountered.
   /// \param BodyGenCB Callback that will generate the region code.
+  /// \param NumTeamsUpper Upper bound on the number of teams.
+  /// \param ThreadLimit on the number of threads that may participate in a
+  ///        contention group created by each team.
   InsertPointTy createTeams(const LocationDescription &Loc,
-                            BodyGenCallbackTy BodyGenCB);
+                            BodyGenCallbackTy BodyGenCB,
+                            Value *NumTeamsUpper = nullptr,
----------------
kiranchandramohan wrote:

So, there are two functions in the OpenMP runtime. It is OK to leave with a TODO, just write a status of the support in Clang and the OpenMP runtime.

```
KMP_EXPORT void __kmpc_push_num_teams(ident_t *loc, kmp_int32 global_tid,
                                      kmp_int32 num_teams,
                                      kmp_int32 num_threads);

/* Function for OpenMP 5.1 num_teams clause */
KMP_EXPORT void __kmpc_push_num_teams_51(ident_t *loc, kmp_int32 global_tid,
                                         kmp_int32 num_teams_lb,
                                         kmp_int32 num_teams_ub,
                                         kmp_int32 num_threads);
```                                 

https://github.com/llvm/llvm-project/pull/68364