PR middle-end/19515

        * expr.c (categorize_ctor_elements): New argument p_must_clear.
        (categorize_ctor_elements_1): Likewise.  Detect a union that isn't
        fully initialized.
        (mostly_zeros_p): Update for new categorize_ctor_elements argument.
        * gimplify.c (gimplify_init_constructor): Likewise.  Only shove
        objects into static storage if they have more than one non-zero value.
        * tree.h (categorize_ctor_elements): Update decl.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@94266 138bc75d-0d04-0410-961f-82ee72b054a4