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branchcache: store the maximum tip in a variable inside for loop

Authored by pulkit.

Description

branchcache: store the maximum tip in a variable inside for loop

Instead of assigning self.tiprev multiple times in the for loop, and calling
cl.node() on it, let's store that in a temporary variable and assign it in the
end of loop.

Differential Revision: https://phab.mercurial-scm.org/D6311