[clang] [llvm] [OpenMP] Adds omp_target_is_accessible routine (PR #138294)

[Shilei Tian via cfe-commits]

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@@ -1069,6 +1069,13 @@ struct GenericDeviceTy : public DeviceAllocatorTy {
   bool useAutoZeroCopy();
   virtual bool useAutoZeroCopyImpl() { return false; }
 
+  /// Returns true if the plugin can guarantee that the associated
+  /// storage is accessible
+  bool isAccessiblePtr(const void *Ptr, size_t Size);
+  virtual bool isAccessiblePtrImpl(const void *Ptr, size_t Size) {
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shiltian wrote:

If this impl function is only for internal use, can we make them private?

https://github.com/llvm/llvm-project/pull/138294