[PATCH] Make sure DW_CFA_advance_loc4 is in the same frag

[Jinyang He <hejinyang@loongson.cn>]

The DW_CFA_advance_loc4 may be in different frags. Then fr_fix
may caused something wrong. Referenced by commit b9d8f5601bcf
("Re: Optimise away eh_frame advance_loc 0").

gas/ChangeLog:

	* ehopt.c (check_eh_frame): Don't allow DW_CFA_advance_loc4
	to be placed in a different frag to the rs_cfa.
---
BTW, it is a bug I triggered when compiling a LoongArch.asm file with
relaxation being enabled. I hope it could be merged to 2.41 as bug-fix.
 
 gas/ehopt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gas/ehopt.c b/gas/ehopt.c
index feea61b92..9d6606adf 100644
--- a/gas/ehopt.c
+++ b/gas/ehopt.c
@@ -386,7 +386,7 @@ check_eh_frame (expressionS *exp, unsigned int *pnbytes)
 	{
 	  /* This might be a DW_CFA_advance_loc4.  Record the frag and the
 	     position within the frag, so that we can change it later.  */
-	  frag_grow (1);
+	  frag_grow (1 + 4);
 	  d->state = state_saw_loc4;
 	  d->loc4_frag = frag_now;
 	  d->loc4_fix = frag_now_fix ();
-- 
2.34.3