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This adds routines for reseting KnownBits to unknown, making the value all zeros or all ones. It also adds methods for querying if the value is zero, all ones or unknown. Differential Revision: https://reviews.llvm.org/D32637 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302262 91177308-0d34-0410-b5e6-96231b3b80d8
To-do ----- * Instruction encodings * Tailcalls * Investigate loop alignment * Add builtins