dix: cache ResourceClientBits() value

The `LimitClient` is set once and for all at startup, whereas the
function `ResourceClientBits()` which returns the client field offset
within the XID based on the value of `LimitClient` can be called
repeatedly.

Small optimization, cache the result of `ilog2()`, that saves running
the same loop over and over each time `ResourceClientBits()` is called.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
1 job for ilog2-optimize in 1 minute and 7 seconds (queued for 1 second)
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passed #61219
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00:01:07