PR100281 C++: Fix SImode pointer handling
The problem appears to be triggered by two locations in the front-end
where non-POINTER_SIZE pointers aren't handled right now.
1. An assertion in strip_typedefs is triggered because the alignment
of the types don't match. This in turn is caused by creating the new
type with build_pointer_type instead of taking the type of the
original pointer into account.
2. An assertion in cp_convert_to_pointer is triggered which expects
the target type to always have POINTER_SIZE.
gcc/cp/ChangeLog:
PR c++/100281
* cvt.c (cp_convert_to_pointer): Use the size of the target
pointer type.
* tree.c (cp_build_reference_type): Call
cp_build_reference_type_for_mode with VOIDmode.
(cp_build_reference_type_for_mode): Rename from
cp_build_reference_type. Add MODE argument and invoke
build_reference_type_for_mode.
(strip_typedefs): Use build_pointer_type_for_mode and
cp_build_reference_type_for_mode for pointers and references.
gcc/ChangeLog:
PR c++/100281
* tree.c (build_reference_type_for_mode)
(build_pointer_type_for_mode): Pick pointer mode if MODE argument
is VOIDmode.
(build_reference_type, build_pointer_type): Invoke
build_*_type_for_mode with VOIDmode.
gcc/testsuite/ChangeLog:
PR c++/100281
* g++.target/s390/pr100281-1.C: New test.
* g++.target/s390/pr100281-2.C: New test.