Fix reload after function-abi patches (PR91948)

The code was passing a pseudo rather than its allocated hard reg
to ira_need_caller_save_p.  Running under valgrind to reproduce
the failure also showed that ALLOCNO_CROSSED_CALLS_ABIS wasn't
being explicitly initialised.

2019-10-01  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR rtl-optimization/91948
	* ira-build.c (ira_create_allocno): Initialize
	ALLOCNO_CROSSED_CALLS_ABIS.
	* ira-color.c (allocno_reload_assign): Pass hard_regno rather
	than regno to ira_need_caller_save_p.

From-SVN: r276407

gcc/ChangeLog

+2019-10-01  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR rtl-optimization/91948
+	* ira-build.c (ira_create_allocno): Initialize
+	ALLOCNO_CROSSED_CALLS_ABIS.
+	* ira-color.c (allocno_reload_assign): Pass hard_regno rather
+	than regno to ira_need_caller_save_p.
+
 2019-10-01  Alexandre Oliva <oliva@adacore.com>
 
 	* config/i386/i386-options.c

gcc/ira-build.c

@@ -504,6 +504,7 @@ ira_create_allocno (int regno, bool cap_p,
   ALLOCNO_CALL_FREQ (a) = 0;
   ALLOCNO_CALLS_CROSSED_NUM (a) = 0;
   ALLOCNO_CHEAP_CALLS_CROSSED_NUM (a) = 0;
+  ALLOCNO_CROSSED_CALLS_ABIS (a) = 0;
   CLEAR_HARD_REG_SET (ALLOCNO_CROSSED_CALLS_CLOBBERED_REGS (a));
 #ifdef STACK_REGS
   ALLOCNO_NO_STACK_REG_P (a) = false;

gcc/ira-color.c

@@ -4398,7 +4398,7 @@ allocno_reload_assign (ira_allocno_t a, HARD_REG_SET forbidden_regs)
 	       ? ALLOCNO_CLASS_COST (a)
 	       : ALLOCNO_HARD_REG_COSTS (a)[ira_class_hard_reg_index
 					    [aclass][hard_regno]]));
-      if (ira_need_caller_save_p (a, regno))
+      if (ira_need_caller_save_p (a, hard_regno))
 	{
 	  ira_assert (flag_caller_saves);
 	  caller_save_needed = 1;