Use SCEVExpander::InsertCastOfTo instead of our own code.  This reduces #LLVM LOC, and auto-cse's cast instructions.
Use SCEVExpander::InsertCastOfTo instead of our own code.  This reduces
#LLVM LOC, and auto-cse's cast instructions.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@25974 91177308-0d34-0410-b5e6-96231b3b80d8

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