Fix reload after function-abi patches (PR91948)

[Richard Sandiford]

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.

Tested on aarch64-linux-gnu and cross-tested against the testcase
on cris-elf.  Applied as obvious.

Richard


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.

Index: gcc/ira-build.c
===================================================================
--- gcc/ira-build.c	2019-10-01 09:55:35.134088716 +0100
+++ gcc/ira-build.c	2019-10-01 13:55:02.074324628 +0100
@@ -504,6 +504,7 @@ ira_create_allocno (int regno, bool cap_
   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;
Index: gcc/ira-color.c
===================================================================
--- gcc/ira-color.c	2019-09-30 17:20:49.594663967 +0100
+++ gcc/ira-color.c	2019-10-01 13:55:02.074324628 +0100
@@ -4398,7 +4398,7 @@ allocno_reload_assign (ira_allocno_t a,
 	       ? 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;