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

[Shilei Tian via llvm-commits]

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@@ -280,6 +280,7 @@ int omp_get_initial_device(void);
 void *omp_target_alloc(size_t Size, int DeviceNum);
 void omp_target_free(void *DevicePtr, int DeviceNum);
 int omp_target_is_present(const void *Ptr, int DeviceNum);
+int omp_target_is_accessible(const void *Ptr, size_t Size, int DeviceNum);
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shiltian wrote:

You will also need to add the entry in `libomp` if I'm not mistaken.

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