dashboard: promote misc-compile-darwinarm64 builder to a TryBot

Testing shows that misc-compile-darwinarm64 is working as expected
on recent commits. Promote it to a normal misc-compile TryBot now,
with the exception that it needs to run on Go 1.16 and newer only.

Fixes golang/go#42341.

Change-Id: Ib4de19a2ff904fb9de056db5076ac63690eb934c
Reviewed-on: https://go-review.googlesource.com/c/build/+/267123
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/dashboard/builders_test.go b/dashboard/builders_test.go
index 97742f6..2648b90 100644
--- a/dashboard/builders_test.go
+++ b/dashboard/builders_test.go
@@ -99,6 +99,7 @@
 				"linux-amd64-race",
 				"misc-compile-other",
 				"misc-compile-darwin",
+				"misc-compile-darwinarm64",
 				"misc-compile-linuxarm",
 				"misc-compile-solaris",
 				"misc-compile-freebsd",
@@ -124,6 +125,7 @@
 				"linux-amd64-race",
 				"misc-compile-other",
 				"misc-compile-darwin",
+				"misc-compile-darwinarm64",
 				"misc-compile-linuxarm",
 				"misc-compile-solaris",
 				"misc-compile-freebsd",
@@ -139,6 +141,37 @@
 		},
 		{
 			repo:   "go",
+			branch: "release-branch.go1.16",
+			want: []string{
+				"android-amd64-emu",
+				"freebsd-amd64-12_0",
+				"js-wasm",
+				"linux-386",
+				"linux-amd64",
+				"linux-amd64-race",
+				"misc-compile-darwin",
+				"misc-compile-darwinarm64", // Starts with Go 1.16.
+				"misc-compile-freebsd",
+				"misc-compile-linuxarm",
+				"misc-compile-mips",
+				"misc-compile-netbsd",
+				"misc-compile-openbsd",
+				"misc-compile-other",
+				"misc-compile-plan9",
+				"misc-compile-ppc",
+				"misc-compile-solaris",
+				"openbsd-amd64-64",
+				"windows-386-2008",
+				"windows-amd64-2016",
+
+				// Include longtest builders on Go repo release branches. See issue 37827.
+				"linux-386-longtest",
+				"linux-amd64-longtest",
+				"windows-amd64-longtest",
+			},
+		},
+		{
+			repo:   "go",
 			branch: "release-branch.go1.14",
 			want: []string{
 				"android-amd64-emu",