[match-and-simplify] Merge from trunk

[Richard Biener]

This merges from trunk and fixes hash-table.h to work on the host
as well as adjusts the VOP PRE changes to the changes done on the
branch.

Boostrapped on x86_64-unknown-linux-gnu.

Richard.

2014-10-15  Richard Biener  <rguent...@suse.de>

        Merge from trunk r214675 through r216234.

        * hash-table.h: Do not include ggc.h on the host but just declare
        a few ggc allocation templates.
        * tree-ssa-pre.c (create_component_ref_by_pieces_1): Set
        VUSE on built call stmts.