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Add basic ComputeNumSignBits support for TRUNCATE ops for cases where the source's number of sign bits overlaps with the truncated size. Improves X86 SIGN_EXTEND_IN_REG vector cases which were needlessly sign extending boolean vector results. Differential Revision: https://reviews.llvm.org/D26851 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287635 91177308-0d34-0410-b5e6-96231b3b80d8