dashboard: add all-compile builder

Runs buildall.bash only.

Change-Id: I1a68d54569ccb511d956c5b181e463503353d4d4
Reviewed-on: https://go-review.googlesource.com/9512
Reviewed-by: David Crawshaw <crawshaw@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 37d2165..1e71f19 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -75,6 +75,9 @@
 	if strings.HasPrefix(c.Name, "darwin-arm") {
 		return "src/iostest.bash"
 	}
+	if c.Name == "all-compile" {
+		return "src/buildall.bash"
+	}
 	return "src/all.bash"
 }
 
@@ -172,6 +175,13 @@
 		env:     []string{"GOROOT_BOOTSTRAP=/go1.4"},
 	})
 	addBuilder(BuildConfig{
+		Name:        "all-compile",
+		VMImage:     "linux-buildlet-std",
+		Notes:       "Runs buildall.sh to compile stdlib for all GOOS/GOARCH, but doesn't run any tests.",
+		buildletURL: "http://storage.googleapis.com/go-builder-data/buildlet.linux-amd64",
+		env:         []string{"GOROOT_BOOTSTRAP=/go1.4"},
+	})
+	addBuilder(BuildConfig{
 		Name:    "linux-amd64-nocgo",
 		Notes:   "cgo disabled",
 		VMImage: "linux-buildlet-std",