[Patch, Fortran] PR37504 Fix special case of PROTECTED pointer assignment

[Paul Richard Thomas]

Tobias,

I was waiting in the hope that somebody who new about PROTECTED would
look at this.  As it is, I have been obliged to look it up; we live
and learn something new every day:-)

>> Build and currently regtesting on x86-64-linux.
>> OK for the trunk if regtesting suceeds?

I take it from the ping that it was OK?

>> Shall I also apply the expr.c part of the patch to 4.3?

OK for trunk and please extend the expr.c part to 4.3.

Thanks for the patch

Paul