debug: Support "phrs" for dumping a HARD_REG_SET
The debug-function in sel-sched-dump.cc that would be
suitable for a hookup to a command in gdb is guarded by
#ifdef INSN_SCHEDULING, thus can't be used for all targets.
Better move the function marked DEBUG_FUNCTION elsewhere,
here to a file with a suitable static function to call.
There are multiple sets of similar functions dumping
HARD_REG_SETs, but cleaning that up is better left to a
separate commit.
gcc:
* gdbinit.in (phrs): New command.
* sel-sched-dump.cc (debug_hard_reg_set): Remove debug-function.
* ira-color.cc (debug_hard_reg_set): New, calling print_hard_reg_set.