re PR rtl-optimization/48272 (internal compiler error: in setup_insn_reg_pressure_info, at haifa-sched.c:1124)

        PR rtl-optimization/48272

        * sched-deps.c (setup_insn_reg_pressure_info): Export and rename to
        init_insn_reg_pressure_info.  Adjust a caller.
        * sched-int.h (init_insn_reg_pressure_info): Declare.
        * haifa-sched.c (haifa_init_insn): Call init_insn_reg_pressure_info
        when sched-pressure is enabled.

        * g++.dg/opt/pr48272.C: New.

From-SVN: r172183