[testsuite] Add scan-offload-tree-dump

[Tom de Vries]

[ was: [PATCH, 0/2] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump ]

Likewise, this patch adds scan-offload-tree-dump, and uses it in 
testsuite/libgomp.oacc-c/vec.c, fixing the todo there.


[ The discussion on how to address to todo started here ( 
https://gcc.gnu.org/ml/gcc-patches/2017-06/msg00319.html ). ]

OK for trunk?

Thanks,
- Tom
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