[OpenMP] Change hint parameter type for critical to uint32_t.

[jlpeyton]

Summary

Add atomic hint flags to the enum.
The hint parameter type was changed to uint32_t in __kmpc_critical_with_hint()

Patch by Olga Malysheva

[hbae]

LGTM.

runtime/src/kmp.h

enum {
   KMP_IDENT_WORK_SECTIONS = 0x400,
   /*! To mark a distirbute construct in OMPT callbacks */
   KMP_IDENT_WORK_DISTRIBUTE = 0x800,
   /*! Atomic hint; bottom four bits as omp_sync_hint_t. Top four reserved and
       not currently used. If one day we need more bits, then we can use
       an invalid combination of hints to mean that another, larger field
       should be used in a different flag. */
   KMP_IDENT_ATOMIC_HINT_MASK = 0xFF0000,
+  KMP_IDENT_ATOMIC_HINT_UNCONTENDED = 0x010000,
+  KMP_IDENT_ATOMIC_HINT_CONTENDED = 0x020000,
+  KMP_IDENT_ATOMIC_HINT_NONSPECULATIVE = 0x040000,
+  KMP_IDENT_ATOMIC_HINT_SPECULATIVE = 0x080000,
 };
 
 /*!
  * The ident structure that describes a source location.
  */
 typedef struct ident {
   kmp_int32 reserved_1; /**<  might be used in Fortran; see above  */
   kmp_int32 flags; /**<  also f.flags; KMP_IDENT_xxx flags; KMP_IDENT_KMPC

 KMP_EXPORT void __kmpc_end_ordered(ident_t *, kmp_int32 global_tid);
 KMP_EXPORT void __kmpc_critical(ident_t *, kmp_int32 global_tid,
                                 kmp_critical_name *);
 KMP_EXPORT void __kmpc_end_critical(ident_t *, kmp_int32 global_tid,
                                     kmp_critical_name *);
 
 #if OMP_45_ENABLED
 KMP_EXPORT void __kmpc_critical_with_hint(ident_t *, kmp_int32 global_tid,
-                                          kmp_critical_name *, uintptr_t hint);
+                                          kmp_critical_name *, uint32_t hint);
 #endif
 
 KMP_EXPORT kmp_int32 __kmpc_barrier_master(ident_t *, kmp_int32 global_tid);
 KMP_EXPORT void __kmpc_end_barrier_master(ident_t *, kmp_int32 global_tid);
 
 KMP_EXPORT kmp_int32 __kmpc_barrier_master_nowait(ident_t *,
                                                   kmp_int32 global_tid);
 

runtime/src/kmp_csupport.cpp

 @param hint the lock hint.
 
 Enter code protected by a `critical` construct with a hint. The hint value is
 used to suggest a lock implementation. This function blocks until the executing
 thread can enter the critical section unless the hint suggests use of
 speculative execution and the hardware supports it.
 */
 void __kmpc_critical_with_hint(ident_t *loc, kmp_int32 global_tid,
-                               kmp_critical_name *crit, uintptr_t hint) {
+                               kmp_critical_name *crit, uint32_t hint) {
   KMP_COUNT_BLOCK(OMP_CRITICAL);
   kmp_user_lock_p lck;
 #if OMPT_SUPPORT && OMPT_OPTIONAL
   omp_state_t prev_state = omp_state_undefined;
   ompt_thread_info_t ti;
   // This is the case, if called from __kmpc_critical:
   void *codeptr = OMPT_LOAD_RETURN_ADDRESS(global_tid);
   if (!codeptr)