cmd/internal/obj: make x86's asmbuf a local variable The x86 assembler requires a buffer to build variable-length instructions. It used to be an obj.Link field. That doesn't play nicely with concurrent assembly. Move the AsmBuf type to the x86 package, where it belongs anyway, and make it a local variable. Passes toolstash-check -all. No compiler performance impact. Updates #15756 Change-Id: I8014e52145380bfd378ee374a0c971ee5bada917 Reviewed-on: https://go-review.googlesource.com/38663 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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