[patch, fortran, committed] Show details of attr->allocated in dump

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Hello world,

I have just committed the patch below as obvious and simple.

Best regards

	Thomas

Show details of attr->allocated with -fdump-fortran-original.

This simple and obvious patch adds output for the var_allocated enum,
to make the status of where the gfortran thinks a potential allocation
came from more clear.

Instead of (example from warn_unused_but_set_variable_4.f90)

attributes: (VARIABLE  ALLOCATABLE DIMENSION REFERENCED 
VALUE-SET(INTENT-OUT) ALLOCATED)

this now displays

attributes: (VARIABLE  ALLOCATABLE DIMENSION REFERENCED 
VALUE-SET(INTENT-OUT) ALLOCATED(ARG))

No user impact (unless the user is exceptionally curious) and no test
case.

gcc/fortran/ChangeLog:

         PR fortran/126058
         * dump-parse-tree.cc (show_attr): Show details of
         attr->allocated.

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