[Patch, Fortran, OOP] PR 57306: ICE on valid with class pointer initialization

[Janus Weil]

>> The attached new version should do the right thing now. At least it
>> shows the correct dump for the original test case as well as yours. It
>> is currently being regtested.
>
> unfortunately it shows a couple of runtime problems with type-bound operators:
>
> FAIL: gfortran.dg/class_defined_operator_1.f03  -O0  execution test
> FAIL: gfortran.dg/typebound_operator_13.f03  -O0  execution test
> FAIL: gfortran.dg/typebound_operator_7.f03  -O0  execution test
> FAIL: gfortran.dg/typebound_operator_8.f03  -O0  execution test
> FAIL: gfortran.dg/typebound_operator_9.f03  -O0  execution test

The attached update fixes it, and thus should hopefully be
regression-free. It also renames 'gfc_class_null_initializer' to
'gfc_class_initializer', since it now also does other initializations
beside EXPR_NULL.

Will do another regtest to make sure it's clean. Ok for trunk if it passes?

Cheers,
Janus
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