re PR rtl-optimization/48144 (ICE: in code_motion_path_driver, at sel-sched.c:6575 with -fselective-scheduling2 and custom flags)

    PR rtl-optimization/48144
    * sel-sched-ir.c (merge_history_vect): Factor out from ...
    (merge_expr_data): ... here.
    (av_set_intersect): Rename to av_set_code_motion_filter.
    Update all callers.  Call merge_history_vect when an expression
    is found in both sets.
    * sel-sched-ir.h (av_set_code_motion_filter): Add prototype.

    gcc/testsuite
    PR rtl-optimization/48144
    * gcc.dg/pr48144.c: New test.

From-SVN: r171555