GNU libgomp: omp_is_initial_device

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### 2.23 `omp_is_initial_device` – Whether executing on the host device

Description:

  This function returns `true` if currently running on the host device, `false` otherwise. Here, `true` and `false` represent their language-specific counterparts.

C/C++:

  Prototype: | `int omp_is_initial_device(void);`

Fortran:

  Interface: | `logical function omp_is_initial_device()`

Reference:

  OpenMP specification v4.5, Section 3.2.34.