[InstCombine] add helper function for shift-shift optimization (NFCI)
This is step 2 of refactoring to solve PR26760: https://llvm.org/bugs/show_bug.cgi?id=26760 llvm-svn: 265951
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This is step 2 of refactoring to solve PR26760: https://llvm.org/bugs/show_bug.cgi?id=26760 llvm-svn: 265951