This prevents panics while attempting to generate code
for the runtime package. Now:

<unknown line number>: internal compiler error: localOffset of non-LocalSlot value: v10 = ADDQconst <*m> [256] v22

Change-Id: I20ed6ec6aae2c91183b8c826b8ebcc98e8ceebff
Reviewed-on: https://go-review.googlesource.com/12655Reviewed-by: Keith Randall <khr@golang.org>