[X86] Fold cmpeq/ne(trunc(x),0) --> cmpeq/ne(x,0)

Relax the fold from rGbaadbe04bf75 to compare any op, not just logic ops, now that the movmsk regressions have been handled.

GitOrigin-RevId: 73737fe9900dae6a7e766043477d646b43d7f284
9 files changed