s390: Fix bootstrap error with checking and -m31.

For a while already we hit an ICE when bootstrapping with -m31 and
--enable-checking=all.

../../../../libgfortran/ieee/ieee_helper.c: In function 'ieee_class_helper_16':
../../../../libgfortran/ieee/ieee_helper.c:77:3: internal compiler error: RTL check: expected code 'reg', have 'subreg' in rhs_regno, at rtl.h:1932
   77 |   }
      |   ^
../../../../libgfortran/ieee/ieee_helper.c:87:1: note: in expansion of macro 'CLASSMACRO'
   87 | CLASSMACRO(16)
      | ^~~~~~~~~~

This patch fixes the problem by first checking for reload_completed
and also ensuring that REGNO is only called on reg operands rather
than subregs.

gcc/ChangeLog:

	* config/s390/s390.md: Move reload_completed and check operands for REG_P.

0 files changed, 0 insertions, 0 deletions