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

[Tobias Burnus <tobias@codesourcery.com>]

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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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commit 99e3214f582b08b69b11b53eb3fc73b0919ef4f1
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Tue Jun 20 13:46:11 2023 +0200

    Fortran: Fix parse-dump-tree for OpenMP ALLOCATE clause
    
    Commit r14-1301-gd64e8e1224708e added u2.allocator to gfc_omp_namelist
    for better readability and to permit to use namelist->expr for code
    like the following:
      !$omp allocators allocate(align(32) : dt%alloc_comp)
        allocate (dt%alloc_comp(5))
      !$omp allocate(dt%alloc_comp2) align(64)
        allocate (dt%alloc_comp2(10))
    However, for the parse-tree dump the change was incomplete.
    
    gcc/fortran/ChangeLog:
    
            * dump-parse-tree.cc (show_omp_namelist): Fix dump of the allocator
            modifier of OMP_LIST_ALLOCATE.

diff --git a/gcc/fortran/dump-parse-tree.cc b/gcc/fortran/dump-parse-tree.cc
index 99c8bdaadce..effcebe9325 100644
--- a/gcc/fortran/dump-parse-tree.cc
+++ b/gcc/fortran/dump-parse-tree.cc
@@ -1370,31 +1370,34 @@ show_omp_namelist (int list_type, gfc_omp_namelist *n)
 		  fputc (list_type == OMP_LIST_AFFINITY ? ':' : ',', dumpfile);
 		}
 	    }
 	  ns_iter = n->u2.ns;
 	}
       if (list_type == OMP_LIST_ALLOCATE)
 	{
-	  if (n->expr)
+	  if (n->u2.allocator)
 	    {
 	      fputs ("allocator(", dumpfile);
 	      show_expr (n->u2.allocator);
 	      fputc (')', dumpfile);
 	    }
 	  if (n->expr && n->u.align)
 	    fputc (',', dumpfile);
 	  if (n->u.align)
 	    {
 	      fputs ("align(", dumpfile);
 	      show_expr (n->u.align);
 	      fputc (')', dumpfile);
 	    }
-	  if (n->expr || n->u.align)
+	  if (n->u2.allocator || n->u.align)
 	    fputc (':', dumpfile);
-	  fputs (n->sym->name, dumpfile);
+	  if (n->expr)
+	    show_expr (n->expr);
+	  else
+	    fputs (n->sym->name, dumpfile);
 	  if (n->next)
 	    fputs (") ALLOCATE(", dumpfile);
 	  continue;
 	}
       if (list_type == OMP_LIST_REDUCTION)
 	switch (n->u.reduction_op)
 	  {