unix/linux: update to Go 1.18rc1

The change in ztypes_linux_s390x.go is likely due to CL 350159.

Change-Id: Ib7080255f357d484ee708e128ac9a7ab408a6dc5
Reviewed-on: https://go-review.googlesource.com/c/sys/+/386955
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/linux/Dockerfile

diff --git a/unix/linux/Dockerfile b/unix/linux/Dockerfile
index 4776350..e36d00d 100644
--- a/unix/linux/Dockerfile
+++ b/unix/linux/Dockerfile
@@ -21,9 +21,9 @@
 RUN git clone --branch release/2.35/master --depth 1 https://sourceware.org/git/glibc.git
 
 # Get Go
-ENV GOLANG_VERSION 1.17.6
+ENV GOLANG_VERSION 1.18rc1
 ENV GOLANG_DOWNLOAD_URL https://golang.org/dl/go$GOLANG_VERSION.linux-amd64.tar.gz
-ENV GOLANG_DOWNLOAD_SHA256 231654bbf2dab3d86c1619ce799e77b03d96f9b50770297c8f4dff8836fc8ca2
+ENV GOLANG_DOWNLOAD_SHA256 9ea4e6adee711e06fa95546e1a9629b63de3aaae85fac9dc752fb533f3e5be23
 
 RUN curl -fsSL "$GOLANG_DOWNLOAD_URL" -o golang.tar.gz \
     && echo "$GOLANG_DOWNLOAD_SHA256  golang.tar.gz" | sha256sum -c - \

unix/ztypes_linux_s390x.go

diff --git a/unix/ztypes_linux_s390x.go b/unix/ztypes_linux_s390x.go
index 6358806..c426c35 100644
--- a/unix/ztypes_linux_s390x.go
+++ b/unix/ztypes_linux_s390x.go
@@ -210,8 +210,8 @@
 }
 
 type PtracePer struct {
-	_             [0]uint64
-	_             [32]byte
+	Control_regs  [3]uint64
+	_             [8]byte
 	Starting_addr uint64
 	Ending_addr   uint64
 	Perc_atmid    uint16