OpenMP: omp.h omp::allocator C++ Allocator interface

The implementation of each allocator is simplified by inheriting from
__detail::__allocator_templ.  At the moment, none of the implementations
diverge in any way, simply passing in the allocator handle to be used when
an allocation is made.  In the future, const_mem will need special handling
added to it to support constant memory space.

libgomp/ChangeLog:

	* omp.h.in: Add omp::allocator::* and ompx::allocator::* allocators.
	(__detail::__allocator_templ<T, omp_allocator_handle_t>):
	New struct template.
	(null_allocator<T>): New struct template.
	(default_mem<T>): Likewise.
	(large_cap_mem<T>): Likewise.
	(const_mem<T>): Likewise.
	(high_bw_mem<T>): Likewise.
	(low_lat_mem<T>): Likewise.
	(cgroup_mem<T>): Likewise.
	(pteam_mem<T>): Likewise.
	(thread_mem<T>): Likewise.
	(ompx::allocator::gnu_pinned_mem<T>): Likewise.
	* testsuite/libgomp.c++/allocator-1.C: New test.
	* testsuite/libgomp.c++/allocator-2.C: New test.

Signed-off-by: waffl3x <waffl3x@baylibre.com>

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