[X86] combineTruncatedArithmetic - move more of fold inside combinei64TruncSrlConstant Let combinei64TruncSrlConstant decide when the fold is invalid instead of splitting so many of the conditions with combineTruncatedArithmetic NOTE: We can probably relax the i32 truncation constraint to <= i32, perform the SRL as i32 and then truncate further. Noticed while triaging #141496
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