[release-branch.go1.9] go1.9

Change-Id: I0899ec0150f2a051b7572879b446a8548f742ae0
Reviewed-on: https://go-review.googlesource.com/58731
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

[release-branch.go1.9] go1.9rc2

Change-Id: If95cec0ec7e32cdb450818c4c55e2d03b847ab65
Reviewed-on: https://go-review.googlesource.com/53630
Reviewed-by: Austin Clements <austin@google.com>

[release-branch.go1.9] go1.9rc1

Change-Id: I6251fc128990f9494a0b037cabb24ada5eabb6b5
Reviewed-on: https://go-review.googlesource.com/50951
Run-TryBot: Chris Broadfoot <cbro@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

cmd/go: add more info in t.Fatal message

Updates golang#20284

Change-Id: I4d55d6adec4e8efb54285ca27bb4fa39c76582c3
Reviewed-on: https://go-review.googlesource.com/46719
Reviewed-by: Chris Broadfoot <cbro@golang.org>

cmd/go: disable tool version check during bootstrap

The check that the go tool version matched the go compiler version was
too aggressive and didn't cover the bootstrapping case with make.bash.

We never noticed because we never had a VERSION file in place.

Repro:

$ echo "go1.9beta1" > $GOROOT/VERSION
$ cd $GOROOT/src
$ ./make.bash

No test, because x/build/cmd/release catches it.

Updates golang#19064
Fixes golang#20674

Change-Id: Ibdd7a92377f4cc77d71ed548f02d48bde6550f67
Reviewed-on: https://go-review.googlesource.com/45778
Reviewed-by: Chris Broadfoot <cbro@golang.org>

[release-branch.go1.8] go1.8.3

Change-Id: I048f21f8ca68758fdd7ac875f7db5e4ed1930f3b
Reviewed-on: https://go-review.googlesource.com/44037
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

[release-branch.go1.8] go1.8.2

Change-Id: Ib04878cbfbb0c09fbd0cc614df314c835e9a6eb0
Reviewed-on: https://go-review.googlesource.com/43991
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

[release-branch.go1.7] go1.7.6

Change-Id: I6361937bb2684c6b64edafc19d7d175210638063
Reviewed-on: https://go-review.googlesource.com/43992
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

[release-branch.go1.8] go1.8.1

Change-Id: Ieb4552841bbf488acdbde805958a1e2ae0bd8aa3
Reviewed-on: https://go-review.googlesource.com/39920
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

[release-branch.go1.8] go1.8

Change-Id: If1e38f02db86449abd4c8a57988d9825b1cf2511
Reviewed-on: https://go-review.googlesource.com/37132
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>