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This adds support for MO_U_QuotRem2 in LLVM backend. Similarly to MO_U_Mul2 we use the standard LLVM instructions (in this case 'udiv' and 'urem') but do the computation on double the word width (e.g., for 64-bit we will do them on 128 registers). Test Plan: validate Reviewers: rwbarton, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1100 GHC Trac Issues: #9430
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