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.

gcc/gdbinit.in

@@ -31,6 +31,7 @@ GCC gdbinit file introduces several debugging shorthands:
     pdd [dw_die_ref],
     pbm [bitmap],
     pel [location_t],
+    phrs [HARD_REG_SET]
     pp, pbs, pcfun
 
 They are generally implemented by calling a function that prints to stderr,
@@ -145,6 +146,17 @@ Print given GENERIC expression in C syntax.
 See also 'help-gcc-hooks'.
 end
 
+define phrs
+eval "set $debug_arg = $%s", $argc ? "arg0" : ""
+call debug_hard_reg_set ($debug_arg)
+end
+
+document phrs
+GCC hook: debug_hard_reg_set (HARD_REG_SET)
+Print given HARD_REG_SET.
+See also 'help-gcc-hooks'.
+end
+
 define pmz
 eval "set $debug_arg = $%s", $argc ? "arg0" : ""
 call mpz_out_str(stderr, 10, $debug_arg)

gcc/ira-color.cc

@@ -512,6 +512,13 @@ print_hard_reg_set (FILE *f, HARD_REG_SET set, bool new_line_p)
     fprintf (f, "\n");
 }
 
+/* Dump a hard reg set SET to stderr.  */
+DEBUG_FUNCTION void
+debug_hard_reg_set (HARD_REG_SET set)
+{
+  print_hard_reg_set (stderr, set, true);
+}
+
 /* Print allocno hard register subforest given by ROOTS and its LEVEL
    to F.  */
 static void

gcc/sel-sched-dump.cc

@@ -986,16 +986,6 @@ debug_blist (blist_t bnds)
   restore_dump ();
 }
 
-/* Dump a hard reg set SET to stderr.  */
-DEBUG_FUNCTION void
-debug_hard_reg_set (HARD_REG_SET set)
-{
-  switch_dump (stderr);
-  dump_hard_reg_set ("", set);
-  sel_print ("\n");
-  restore_dump ();
-}
-
 /* Debug a cfg region with default flags.  */
 void
 sel_debug_cfg (void)