target-alpha: Rewrite gen_ext_[hl] in terms of zapnot.
The architecture manual specifies the EXT instructions in terms of the ZAPNOT operation; writing it that way in the translator makes things a bit clearer. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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