[gomp4] map the '*' tile argument onto integer_zero_node in fortran

[Cesar Philippidis]

As the subject states, this patch maps the '*' tile clause arguments
onto integer_zero_node. Before the fortran FE was using mapping it onto
-1. This patch should make the clause parsing in fortran on par with the
C and C++ FEs.

This patch has been applied to gomp-4_0-branch.

Cesar
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