Switch to a very conservative heuristic for determining when loop-unswitching will be profitable.  This is mainly to remove some cases where excessive unswitching would result in long compile times and/or huge generated code.
Switch to a very conservative heuristic for determining when loop-unswitching
will be profitable.  This is mainly to remove some cases where excessive
unswitching would result in long compile times and/or huge generated code.

Once someone comes up with a better heuristic that avoids these cases, this
should be switched out.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@28962 91177308-0d34-0410-b5e6-96231b3b80d8

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