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2fdaef6a15
MWAITX doesn't touch EFLAGS so no pseudos should def EFLAGS. The SAVE_EBX/RBX pseudos only needs to def the EBX register that the expansion overwrites. The EAX and ECX registers are only read. The pseudo emitted during isel that is used by the custom inserter shouldn't have any implicit defs or uses since everything is in vregs.