arm64/arm64asm: recognise new ssbb/pssbb mnemonics from objdump

Fixes golang/go#27754

Change-Id: I8fcc3bc3c718cf0d93afbd1d383df48316b522d4
Reviewed-on: https://go-review.googlesource.com/136455
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Gbp-Pq: Name arm64-arm64asm-recognise-new-ssbb-pssbb-mnemonics-fr.patch

cmd/internal/objfile: only consider executable segments for load address

Reportedly on some new Fedora systems the linker is producing extra
load segments, basically making the dynamic section non-executable.
We were assuming that the first load segment could be used to
determine the program's load offset, but that is no longer true.
Use the first executable load segment instead.

Fixes #26369

Change-Id: I5ee31ddeef2e8caeed3112edc5149065a6448456
Reviewed-on: https://go-review.googlesource.com/127895
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Gbp-Pq: Name only-consider-executable-segments.patch

reproducible-BUILD_PATH_PREFIX_MAP

Gbp-Pq: Name 0002-reproducible-BUILD_PATH_PREFIX_MAP.patch

golang-1.10 (1.10.4-2) unstable; urgency=medium

  * d/patches/arm64-arm64asm-recognise-new-ssbb-pssbb-mnemonics-fr.patch:
    backport another ftbfs fix from upstream.

[dgit import unpatched golang-1.10 1.10.4-2]

Import golang-1.10_1.10.4-2.debian.tar.xz

[dgit import tarball golang-1.10 1.10.4-2 golang-1.10_1.10.4-2.debian.tar.xz]

Import golang-1.10_1.10.4.orig.tar.gz

[dgit import orig golang-1.10_1.10.4.orig.tar.gz]