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Slightly reorganize struct SnapshotData.

This squeezes out a bunch of alignment padding, reducing the sizefrom 72 to 56 bytes on my machine. At least in my testing, thisdidn't produce any measurable performance improvement, but the spacesavings seem like enough justification.Andres Freund

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src/include/utils
- snapshot.h

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`‎src/include/utils/snapshot.h`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -46,13 +46,14 @@ typedef struct SnapshotData`
`46`	`46`	`*/`
`47`	`47`	`TransactionIdxmin;/* all XID < xmin are visible to me */`
`48`	`48`	`TransactionIdxmax;/* all XID >= xmax are invisible to me */`
`49`		`-uint32xcnt;/* # of xact ids in xip[] */`
`50`	`49`	`TransactionIdxip;/ array of xact IDs in progress */`
	`50`	`+uint32xcnt;/* # of xact ids in xip[] */`
`51`	`51`	`/* note: all ids in xip[] satisfy xmin <= xip[i] < xmax */`
`52`	`52`	`int32subxcnt;/* # of xact ids in subxip[] */`
`53`	`53`	`TransactionIdsubxip;/ array of subxact IDs in progress */`
`54`	`54`	`boolsuboverflowed;/* has the subxip array overflowed? */`
`55`	`55`	`booltakenDuringRecovery;/* recovery-shaped snapshot? */`
	`56`	`+boolcopied;/* false if it's a static snapshot */`
`56`	`57`
`57`	`58`	`/*`
`58`	`59`	`* note: all ids in subxip[] are >= xmin, but we don't bother filtering`
`@@ -61,7 +62,6 @@ typedef struct SnapshotData`
`61`	`62`	`CommandIdcurcid;/* in my xact, CID < curcid are visible */`
`62`	`63`	`uint32active_count;/* refcount on ActiveSnapshot stack */`
`63`	`64`	`uint32regd_count;/* refcount on RegisteredSnapshotList */`
`64`		`-boolcopied;/* false if it's a static snapshot */`
`65`	`65`	`}SnapshotData;`
`66`	`66`
`67`	`67`	`/*`

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Commit1fc3d18

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`‎src/include/utils/snapshot.h`

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