[OpenMPOpt][Fix] Only initialize ICV initial values once.

[sstefan1]

Summary

This is mostly taken from D85703 and should go in separately.

[jdoerfert]

LGTM

llvm/include/llvm/Frontend/OpenMP/OMPConstants.h

 #include "llvm/Frontend/OpenMP/OMPKinds.def"
 };
 
 #define ICV_DATA_ENV(Enum, ...)                                                \
   constexpr auto Enum = omp::InternalControlVar::Enum;
 #include "llvm/Frontend/OpenMP/OMPKinds.def"
 
 enum class ICVInitValue {
-#define ICV_DATA_ENV(Enum, Name, EnvVar, Init) Init,
+#define ICV_INIT_VALUE(Enum, Name) Enum,
 #include "llvm/Frontend/OpenMP/OMPKinds.def"
 };
 
-#define ICV_DATA_ENV(Enum, Name, EnvVar, Init)                                 \
-  constexpr auto Init = omp::ICVInitValue::Init;
+#define ICV_INIT_VALUE(Enum, Name)                                             \
+  constexpr auto Enum = omp::ICVInitValue::Enum;
 #include "llvm/Frontend/OpenMP/OMPKinds.def"
 
 /// IDs for all omp runtime library (RTL) functions.
 enum class RuntimeFunction {
 #define OMP_RTL(Enum, ...) Enum,
 #include "llvm/Frontend/OpenMP/OMPKinds.def"
 };
 

llvm/include/llvm/Frontend/OpenMP/OMPKinds.def

 #undef OMP_FUNCTION_TYPE
 
 ///}
 
 /// Internal Control Variables information
 ///
 ///{
 
+#ifndef ICV_INIT_VALUE
+#define ICV_INIT_VALUE(Enum, Name)
+#endif
+
+#define __ICV_INIT_VALUE(Name) ICV_INIT_VALUE(ICV_##Name, #Name)
+
+__ICV_INIT_VALUE(ZERO)
+__ICV_INIT_VALUE(FALSE)
+__ICV_INIT_VALUE(IMPLEMENTATION_DEFINED)
+__ICV_INIT_VALUE(LAST)
+
+#undef __ICV_INIT_VALUE
+#undef ICV_INIT_VALUE
+
 #ifndef ICV_DATA_ENV
 #define ICV_DATA_ENV(Enum, Name, EnvVarName, Init)
 #endif
 
 #define __ICV_DATA_ENV(Name, EnvVarName, Init)                                 \
   ICV_DATA_ENV(ICV_##Name, #Name, #EnvVarName, Init)
 
 __ICV_DATA_ENV(nthreads, OMP_NUM_THREADS, ICV_IMPLEMENTATION_DEFINED)
 __ICV_DATA_ENV(active_levels, NONE, ICV_ZERO)
 __ICV_DATA_ENV(cancel, OMP_CANCELLATION, ICV_FALSE)
+__ICV_DATA_ENV(proc_bind, OMP_PROC_BIND, ICV_IMPLEMENTATION_DEFINED)
 __ICV_DATA_ENV(__last, last, ICV_LAST)
 
 #undef __ICV_DATA_ENV
 #undef ICV_DATA_ENV
 
 #ifndef ICV_RT_SET
 #define ICV_RT_SET(Name, RTL)
 #endif