toplev.c (floor_log2, exact_log2): Don't define if __cplusplus.

        * toplev.c (floor_log2, exact_log2): Don't define if __cplusplus.
        (push_srcloc): Use XNEW.
        (init_asm_output, default_get_pch_validity): Use XNEWVEC.

Co-Authored-By: Marcin Dalecki <martin@dalecki.de>

From-SVN: r110372