Rename LWLockWaitUntilFree to LWLockAcquireOrWait.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 1a01560cbb78ff363fc7d70298328aa23f05bfb5
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2012-02-08T07:17:13Z
Releases: 9.2.0
Rename LWLockWaitUntilFree to LWLockAcquireOrWait.

LWLockAcquireOrWait makes it more clear that the lock is acquired if it's
free.

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