Remove an unnecessary temporary variable for clarity of presentation in

Remove an unnecessary temporary variable for clarity of presentation in
a loop that GCC 4.2.0 is miscompiling.  Ticket #2469.  GCC 4.2.0 miscompiles
this loop regardless of whether or not the temporary variable is used, but
by removing the variable, we hope to make it easier to explain the problem
to GCC maintainers.  The error only appears if -ftree-vrp is used (which
is turned on by -O2). (CVS 4150)

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