reorder 'struct block' fields.

On 64-bit builds, there was a 32-bit hole near the beginning. Shuffle this
towards the middle of the struct (just before the blk_u union).

Unfortunately this (moved) hole can't be filled by having an I32 at the
start of each union member, since struct block_eval is already the largest
and has no 32-bit fields.

Still, moving further on than some of the hotter fields can't hurt.

1 files changed, 2 insertions, 2 deletions

diff --git a/cop.h b/cop.h
index 8527384221..8408e093db 100644
--- a/cop.h
+++ b/cop.h
@@ -880,11 +880,11 @@ struct block {
     I32		blku_oldsaveix; /* saved PL_savestack_ix */
     /* all the fields above must be aligned with same-sized fields as sbu */
     I32		blku_oldsp;	/* current sp floor: where nextstate pops to */
-    COP *	blku_oldcop;	/* old curcop pointer */
     I32		blku_oldmarksp;	/* mark stack index */
-    I32		blku_oldscopesp;	/* scope stack index */
+    COP *	blku_oldcop;	/* old curcop pointer */
     PMOP *	blku_oldpm;	/* values of pattern match vars */
     SSize_t     blku_old_tmpsfloor;     /* saved PL_tmps_floor */
+    I32		blku_oldscopesp;	/* scope stack index */
 
     union {
 	struct block_sub	blku_sub;