go1.11.5

runtime: use QPC for nanotime and time.now on windows/arm

The previous implementation of nanotime and time.now used a time source
that was updated on the system clock tick, which has a maximum
resolution of about 1ms. On 386 and amd64, this time source maps to
the system performance counter, so has much higher resolution.
On ARM, use QueryPerformanceCounter() to get a high resolution timestamp.

Updates golang#26148

Change-Id: I1abc99baf927a95b472ac05020a7788626c71d08
Reviewed-on: https://go-review.googlesource.com/c/154758
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

[release-branch.go1.11] go1.11.4

Change-Id: Id4fe02a5b26da92e99d9817ecbf518682c4345b2
Reviewed-on: https://go-review.googlesource.com/c/154307
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

[release-branch.go1.10] go1.10.7

Change-Id: Ic9020b53da56c34250801e996248edbd3a4c632e
Reviewed-on: https://go-review.googlesource.com/c/154308
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

[release-branch.go1.11-security] go1.11.3

Change-Id: I0933c8d2f635e987db1a36030ef330f77b5ef8a8
Reviewed-on: https://team-review.git.corp.google.com/c/377323
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

[release-branch.go1.10-security] go1.10.6

Change-Id: I1a05884b2df711da15d2ca3f09fcb6fc4a3264c7
Reviewed-on: https://team-review.git.corp.google.com/c/377324
Reviewed-by: Andrew Bonventre <andybons@google.com>

[release-branch.go1.11] go1.11.2

Change-Id: Idd3527ba8f2329876cbca646aacd97739b9828f7
Reviewed-on: https://go-review.googlesource.com/c/147217
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

[release-branch.go1.10] go1.10.5

Change-Id: Ibad4471510ea8546954c4361424daadb845b2f3f
Reviewed-on: https://go-review.googlesource.com/c/147183
Run-TryBot: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

[release-branch.go1.11] go1.11.1

Change-Id: I3cf3e57b11ad02b497276bae1864fc5ade8144b9
Reviewed-on: https://go-review.googlesource.com/138860
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

[release-branch.go1.11] runtime: mark sigInitIgnored nosplit

The sigInitIgnored function can be called by initsig before a shared
library is initialized, before the runtime is initialized.

Fixes golang#27183

Change-Id: I7073767938fc011879d47ea951d63a14d1cce878
Reviewed-on: https://go-review.googlesource.com/131277
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit d20ecd6e5dab55376ea4f169eed63608f9bb3b2b)
Reviewed-on: https://go-review.googlesource.com/131278
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>