[llvm-bugs] [Bug 41359] New: [TargetLowering] Merge preferShiftsToClearExtremeBits into shouldFoldShiftPairToMask

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41359

            Bug ID: 41359
           Summary: [TargetLowering] Merge preferShiftsToClearExtremeBits
                    into shouldFoldShiftPairToMask
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: craig.topper at gmail.com, lebedev.ri at gmail.com,
                    llvm-bugs at lists.llvm.org, llvm-dev at redking.me.uk,
                    spatel+llvm at rotateright.com

These TargetLowering features are close enough that we should probably just get
rid of preferShiftsToClearExtremeBits.

An initial attempt caused some changes due to subtle differences in logic which
need addressing.

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