cmd/8l: fix data corruption for MULB SI,
The 8l linker automatically inserts XCHG instructions to support otherwise impossible byte registers (only available on AX, BX, CX, DX). Sometimes AX or DX is needed (for MUL and DIV) so we need to avoid clobbering them. R=golang-dev, dave, iant, iant, rsc CC=golang-dev https://golang.org/cl/6846057
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