[fpc-devel] x86-64: MOVZX peephole optimisations

[J. Gareth Moreton]

 And apologies for my horrendous grammar in that last e-mail!  What I
meant to say is that an option could be that x86-64 can favour MOVZX, since
the oldest processors are guaranteed to have been first released no earlier
than the early 2000s, while i386 and i8086 can favour MOV + AND, unless
more conditional checks "if current_settings.cputype
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