[PTR-PLUS] Fix C++ libgomp failures

[Andrew_Pinski@PlayStation.Sony.Com]

The problem is just the normal problem of updating the creating of 
PLUS_EXPR to POINTER_PLUS_EXPR and needing removing the cast to the 
pointer type.

Committed after a build/test on i686-linux-gnu of the C++ libgomp tests.

Thanks,
Andrew Pinski

ChangeLog:

        * cp-gimplify.c (cxx_omp_clause_apply_fn): Convert
        PLUS_EXPR on pointer types over to use
        POINTER_PLUS_EXPR and remove the conversion
        to the pointer types.

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