[SCEV] Removing deprecated comment in ScalarEvolutionExpander

Removing a comment in the ScalarEvolutionExpander.cpp file that was about the
class SCEVSDivExpr, which has been long gone from LLVM.

llvm-svn: 375232

lib/Analysis/ScalarEvolutionExpander.cpp

@@ -240,9 +240,6 @@ Value *SCEVExpander::InsertBinop(Instruction::BinaryOps Opcode,
 /// division. If so, update S with Factor divided out and return true.
 /// S need not be evenly divisible if a reasonable remainder can be
 /// computed.
-/// TODO: When ScalarEvolution gets a SCEVSDivExpr, this can be made
-/// unnecessary; in its place, just signed-divide Ops[i] by the scale and
-/// check to see if the divide was folded.
 static bool FactorOutConstant(const SCEV *&S, const SCEV *&Remainder,
                               const SCEV *Factor, ScalarEvolution &SE,
                               const DataLayout &DL) {