Change create*Pass factory functions to return Pass* instead of

LoopPass*.
 - Although less precise, this means they can be used in clients
   without RTTI (who would otherwise need to include LoopPass.h, which
   eventually includes things using dynamic_cast). This was the
   simplest solution that presented itself, but I am happy to use a
   better one if available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58010 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/LoopStrengthReduce.cpp

@@ -213,7 +213,7 @@ char LoopStrengthReduce::ID = 0;
 static RegisterPass<LoopStrengthReduce>
 X("loop-reduce", "Loop Strength Reduction");
 
-LoopPass *llvm::createLoopStrengthReducePass(const TargetLowering *TLI) {
+Pass *llvm::createLoopStrengthReducePass(const TargetLowering *TLI) {
   return new LoopStrengthReduce(TLI);
 }