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pg_stat_statements: Add a comment about the dangers of padding bytes.

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Original file line number	Diff line number	Diff line change
`@@ -125,6 +125,11 @@ typedef enum pgssVersion`
`125`	`125`	`/*`
`126`	`126`	`* Hashtable key that defines the identity of a hashtable entry. We separate`
`127`	`127`	`* queries by user and by database even if they are otherwise identical.`
	`128`	`+ *`
	`129`	`+ * Right now, this structure contains no padding. If you add any, make sure`
	`130`	`+ * to teach pgss_store() to zero the padding bytes. Otherwise, things will`
	`131`	`+ * break, because pgss_hash is created using HASH_BLOBS, and thus tag_hash`
	`132`	`+ * is used to hash this.`
`128`	`133`	`*/`
`129`	`134`	`typedefstructpgssHashKey`
`130`	`135`	`{`

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