Relax the "don't unroll loops containing calls" rule. Instead, when a loop...

Relax the "don't unroll loops containing calls" rule.  Instead, when a loop contains a call, lower the
unrolling threshold to the optimize-for-size threshold.  Basically, for loops containing calls, unrolling
can still be profitable as long as the loop is REALLY small.

llvm-svn: 113439