[og9] Allow the accelerator to have more offloaded functions than the host

[Julian Brown]

Hi,

This patch was previously posted here by Cesar:

https://gcc.gnu.org/ml/gcc-patches/2017-10/msg00668.html

This patch is necessary when not all objects containing offload code
are linked into the final executable, including those in static
libraries. Re-tested with offloading to nvptx. I will apply to the
openacc-gcc-9-branch shortly.

Thanks,

Julian

ChangeLog

2019-07-10  Cesar Philippidis  <cesar@codesourcery.com>

	libgomp/
	* target.c (gomp_load_image_to_device): Allow the accelerator to
	possess more offloaded functions than the host.
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