This replaces *memHdr with memHdrPtr.

Updates #10600.

Change-Id: I673aa2cd20f29abec8ab91ed7e783718c8479ce1
Reviewed-on: https://go-review.googlesource.com/17009
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>