[gomp4] Fix handling of subarrays with update directive

[James Norris]

Hi,

The attached patch fixes a defect reported with gcc 5.2
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69414).
It is also the case, the issue is present in the gomp4
branch. The patch also adds additional testing.

Committed to gomp4 after bootstrap and regtesting.

Thanks,
Jim

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