[pph] Mainline merge @167963

[Diego Novillo]

A couple of conflicts in the merge, but nothing too big.

Bootstrapped and tested on x86_64.


gcc/ChangeLog.pph
        Mainline merge r167963.

        * BASE-VER: Update revision stamp.

libcpp/ChangeLog.pph

        * internal.h (struct cpp_lookaside): Rename field
        flag_pth_debug to pth_debug_level.


gcc/cp/ChangeLog.pph

        * pph.c (pph_find_exposed_for, pph_get_decl_exposure):
        Replace uses of DECL_INTEGRAL_CONSTANT_VAR_P with
        decl_constant_var_p.


Diego.