[PATCHES] [x86] Add -code16 triple environment, fix various disassembler issues

[David Woodhouse]

The disassembler issues are all relatively straightforward; my main
question is why callw was marked as isAsmParserOnly and if we really do
need to hide it from codegen. (Is that just because we don't have
relaxation support for 2-byte offsets if it turns out to reference
something further away?)

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse at intel.com                              Intel Corporation
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