enum-ify resource manager's xl_info values

Hi,

Would somebody object to making the rmgr's invo value #defines like:

/* XLOG info values for XLOG rmgr */
#define XLOG_CHECKPOINT_SHUTDOWN 0x00
#define XLOG_CHECKPOINT_ONLINE 0x10
#define XLOG_NOOP 0x20
#define XLOG_NEXTOID 0x30
#define XLOG_SWITCH 0x40
#define XLOG_BACKUP_END 0x50
#define XLOG_PARAMETER_CHANGE 0x60
#define XLOG_RESTORE_POINT 0x70
#define XLOG_FPW_CHANGE 0x80
#define XLOG_END_OF_RECOVERY 0x90
#define XLOG_FPI 0xA0

into enums? We already have a bunch of places looking at those values
and if/when changeset extraction makes it in, it's going to be one
more. Having the compiler tell you where a new value should have been
been added as well helps.

Greetings,

Andres Freund

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Andres Freund http://www.2ndQuadrant.com/
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