The macro is taken from the upstream commit
40f908bd.

This commit fixes issues for CLUSTER and COPY command where the commands would
not generate necessary XLOG records when streaming replication is enabled. With
the correct use of XLogIsNeeded() this is now fixed.

This also cleans up the XLog_CanBypassWal() and XLog_UnconvertedCanBypassWal()
functions by replacing their usage with XLogIsNeeded().
Signed-off-by: NTaylor Vesely <tvesely@pivotal.io>
Signed-off-by: NAsim R P <apraveen@pivotal.io>