[committed] Fortran: Fix parse-dump-tree for OpenMP ALLOCATE clause

[Tobias Burnus]

A rather obvious fix. The allocator(...) bit showed up with -fdump-parse-tree.

Committed as Rev. r14-1988-g99e3214f582b08

Side remark:

Regarding the example inside the commit log: OpenMP 5.1 permitted derived-type
components. Due to global wording changes, OpenMP 5.2 disabled it for both
the new 'allocators' and for the old 'allocate' directive. This turned out to be
an accidental change and it will be permitted in a future OpenMP version again
(for 'allocators' as the executable form of the 'allocate' directive was deprecated
and then removed; in GCC, we will have to support it for both for legacy support
reasons). – While n->expr is now support for the dump, it is currently unreachable
as dt-component parsing is disabled for both allocate and allocators. (To be changed.)

Tobias
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