[Patch, Fortran] OOP cleanup part 2

[Janus Weil <janus at gcc dot gnu dot org>]

Hi all,

here is another cleanup patch for OOP. It simply introduces the
following macro in gfortran.h (as proposed by Paul):

#define CLASS_DATA(sym) sym->ts.u.derived->components

It often happens that we need to access the $data component of a class
container, and the macro does exactly that ($data is the first
component of the class container). I tried to apply the macro in all
places where it's suitable and hope I forgot none.

One place where the macro unfortunately cannot be applied for
technical reasons is 'gfc_type_compatible' (still I made some
modifications on this) and the beginning of 'resolve_fl_derived'.

Paul, is this what you had in mind? Or are there more clever ways to do it?

The patch was regtested on x86_64-unknown-linux-gnu. Ok for trunk?
(With a ChangeLog, which I yet have to construct).

Cheers,
Janus

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