"llvm/lib/IR/PassManager.cpp" did not exist on "41b98843e84b37423282ed9f639cf5c0957c76e1"
Add a ConstantSignedRange class, which does for signed integers
what ConstantRange does for unsigned integers. Factor out a common base class for common functionality. Add some new functions for performing arithmetic on constant ranges. Some of these are currently just stubbed out with conservative implementations. Add unittests for ConstantRange and ConstantSignedRange. llvm-svn: 75177
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