use cc provided xlog2 instead of system log2. (on plan 9 cc calls it log2, but that conflicts here.) the difference is that xlog2 returns -1 on non powers of 2. 8c was rewriting /10 into /8.
use cc provided xlog2 instead of system log2.
(on plan 9 cc calls it log2, but that conflicts here.)
the difference is that xlog2 returns -1 on non powers of 2.
8c was rewriting /10 into /8.

R=ken
OCL=29968
CL=29968

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