d: Fix ICE: verify_gimple_failed (conversion of register to a different size in 'view_convert_expr')
Static arrays in D are passed around by value, rather than decaying to a
pointer. On x86_64 __builtin_va_list is an exception to this rule, but
semantically it's still treated as a static array.
This makes certain assignment operations fail due a mismatch in types.
As all examples in the test program are rejected by C/C++ front-ends,
these are now errors in D too to be consistent.
PR d/110712
gcc/d/ChangeLog:
* d-codegen.cc (d_build_call): Update call to convert_for_argument.
* d-convert.cc (is_valist_parameter_type): New function.
(check_valist_conversion): New function.
(convert_for_assignment): Update signature. Add check whether
assigning va_list is permissible.
(convert_for_argument): Likewise.
* d-tree.h (convert_for_assignment): Update signature.
(convert_for_argument): Likewise.
* expr.cc (ExprVisitor::visit (AssignExp *)): Update call to
convert_for_assignment.
gcc/testsuite/ChangeLog:
* gdc.dg/pr110712.d: New test.
(cherry picked from commit
ea8ffdcadb388b531adf4772287e7987a82a84b7)