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Like the TEXT/GLOBL flags, this was split between from.scale and reg,
neither of which is appropriate.

Change-Id: I2a16ef066a53b6edb7afb16cce108c0d1d26389c
Reviewed-on: https://go-review.googlesource.com/3576

Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Austin Clements <austin@google.com>