* gcse.c (expr_reaches_here_p): Use xcalloc and explit free instead
        of alloca.
        (pre_gcse): Likewise.
        (hoist_expr_reaches_here_p): Likewise.
        (hoist_code): Likewise.
        (pre_expr_reaches_here_p): Replace alloca with xcalloc.   Move core
        code to ...
        (pre_expr_reaches_here_p_work): ... here.
        (expr_reaches_here_p): Replace alloca with xcalloc.   Move core
        code to ...
        (expr_reaches_here_p_work): ... here.

From-SVN: r30207