cmd/compile: On PPC, nilcheck load should be MOVBZ
There's no load-signed-byte on PPC, so MOVB causes the assembler to macro-expand in a useless sign extension. Fixes #17211. Change-Id: Ibcd73aea4c94ba6df0a998b0091e45508113be2a Reviewed-on: https://go-review.googlesource.com/29762 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Michael Munday <munday@ca.ibm.com> Reviewed-by:
Cherry Zhang <cherryyz@google.com>
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