[NPM] Port -slsr to NPM

[TaWeiTu]

Summary

-separate-const-offset-from-gep has not yet be ported, so some tests are not updated.

[TaWeiTu]

This comment was removed by TaWeiTu.

[TaWeiTu]

This comment was removed by TaWeiTu.

[TaWeiTu]

Preserve CFG analyses.

llvm/include/llvm/Transforms/Scalar/StraightLineStrengthReduce.h

+//===- StraightLineStrengthReduce.h - -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_STRAIGHTLINESTRENGTHREDUCE_H
+#define LLVM_TRANSFORMS_SCALAR_STRAIGHTLINESTRENGTHREDUCE_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class StraightLineStrengthReducePass
+    : public PassInfoMixin<StraightLineStrengthReducePass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
+} // namespace llvm
+
+#endif // LLVM_TRANSFORMS_SCALAR_STRAIGHTLINESTRENGTHREDUCE_H