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Revert "[X86] Remove patterns for ADC/SBB with immediate 8 and optimi…
…ze during MC lowering, NFCI" This caused compiler assertions, see comment on https://reviews.llvm.org/D150107. This also reverts the dependent follow-up change: > [X86] Remove patterns for ADD/AND/OR/SUB/XOR/CMP with immediate 8 and optimize during MC lowering, NFCI > > This is follow-up of D150107. > > In addition, the function `X86::optimizeToFixedRegisterOrShortImmediateForm` can be > shared with project bolt and eliminates the code in X86InstrRelaxTables.cpp. > > Differential Revision: https://reviews.llvm.org/D150949 This reverts commit 2ef8ae1 and 5586bc5.
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