[patch, libgomp] Add tests for print from offload target

[Andrew Stubbs]

Hi,

This patch adds new libgomp tests to ensure that C "printf" and Fortran 
"write" work correctly within offload kernels. Both should work for 
amdgcn, but nvptx uses the libgfortran "minimal" mode which lacks 
"write" support.

Obviously, printing from offload kernels is not recommended in 
production, but can be useful in development.

OK to commit?

Thanks

Andrew
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