cmd/internal/obj/s390x: add atomic operation instructions
Adds the following s390x instructions from the interlocked access facility: * LAA(G) - load and add * LAAL(G) - load and add logical * LAN(G) - load and and * LAX(G) - load and exclusive or * LAO(G) - load and or These instructions can be used for atomic arithmetic/logical operations. The atomic packages will be updated in future CLs. Change-Id: Idc850ac6749b3e778fda3da66bcd864f6b1df375 Reviewed-on: https://go-review.googlesource.com/27871Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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