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Summary: With this change, subclasses of `llvm::User` will be able to co-allocate a variable number of bytes (called a "descriptor") with the `llvm::User` instance. The co-allocated descriptor can later be accessed using `llvm::User::getDescriptor`. This will be used in later changes to implement operand bundles. This change steals one bit from `NumUserOperands`, but given that it is still 28 bits wide I don't think this will be a practical issue. This change does not allow allocating hung off uses with descriptors. This only for simplicity, not for any fundamental reason; and we can easily add this functionality later if needed. Reviewers: reames, chandlerc, dexonsmith, kmod, majnemer, pete, JosephTremoulet Subscribers: pete, sanjoy, llvm-commits Differential Revision: http://reviews.llvm.org/D12455 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248453 91177308-0d34-0410-b5e6-96231b3b80d8
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