dashboard: upsize freebsd-amd64-race builder to 7.2 GB RAM

Start using n1-highcpu-8 machine type instead of n1-highcpu-4
for the freebsd-amd64-race builder.

The freebsd-amd64-race builder has produced good test results
for the x/tools repo for a long time, but by now it has started
to consistently fail for reasons that seem connected to it having
only 3.6 GB memory. The Windows race builders needed to be bumped
from 7.2 GB to 14.4 GB to run successfully, so this change makes
a small incremental step to bring freebsd-amd64-race closer in
line with other builders. If memory-related problems continue to
occur with 7.2 GB, the next step will be to go up to 14.4 GB.

The freebsd-amd64-race builder is using an older version of FreeBSD.
We may want to start using a newer one for running tests with -race,
but that should be a separate change so we can see the results of
this change without another confounding variable.

Also update all FreeBSD builders to use https in buildletURLTmpl,
because it's expected to work fine and will be more consistent.

Updates golang/go#36444
Updates golang/go#34621
Updates golang/go#29252
Updates golang/go#33986

Change-Id: Idfcefd1c91bddc9f70ab23e02fcdca54fda9d1ac
Reviewed-on: https://go-review.googlesource.com/c/build/+/214433
Run-TryBot: Carlos Amedee <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>

dashboard/builders.go

@@ -291,7 +291,7 @@ var Hosts = map[string]*HostConfig{
 		VMImage:            "freebsd-amd64-103-b",
 		Notes:              "FreeBSD 10.3; GCE VM is built from script in build/env/freebsd-amd64",
 		machineType:        "n1-highcpu-4",
-		buildletURLTmpl:    "http://storage.googleapis.com/$BUCKET/buildlet.freebsd-amd64", // TODO(bradfitz): why was this http instead of https?
+		buildletURLTmpl:    "https://storage.googleapis.com/$BUCKET/buildlet.freebsd-amd64",
 		goBootstrapURLTmpl: "https://storage.googleapis.com/$BUCKET/go1.4-freebsd-amd64.tar.gz",
 		env:                []string{"CC=clang"},
 		SSHUsername:        "gopher",
@@ -308,7 +308,16 @@ var Hosts = map[string]*HostConfig{
 		VMImage:            "freebsd-amd64-111-b",
 		Notes:              "FreeBSD 11.1; GCE VM is built from script in build/env/freebsd-amd64",
 		machineType:        "n1-highcpu-4",
-		buildletURLTmpl:    "http://storage.googleapis.com/$BUCKET/buildlet.freebsd-amd64", // TODO(bradfitz): why was this http instead of https?
+		buildletURLTmpl:    "https://storage.googleapis.com/$BUCKET/buildlet.freebsd-amd64",
+		goBootstrapURLTmpl: "https://storage.googleapis.com/$BUCKET/go1.4-freebsd-amd64.tar.gz",
+		env:                []string{"CC=clang"},
+		SSHUsername:        "gopher",
+	},
+	"host-freebsd-11_1-big": &HostConfig{
+		VMImage:            "freebsd-amd64-111-b",
+		Notes:              "Same as host-freebsd-11_1, but on n1-highcpu-8",
+		machineType:        "n1-highcpu-8", // 8 vCPUs, 7.2 GB mem
+		buildletURLTmpl:    "https://storage.googleapis.com/$BUCKET/buildlet.freebsd-amd64",
 		goBootstrapURLTmpl: "https://storage.googleapis.com/$BUCKET/go1.4-freebsd-amd64.tar.gz",
 		env:                []string{"CC=clang"},
 		SSHUsername:        "gopher",
@@ -1437,7 +1446,7 @@ func init() {
 	})
 	addBuilder(BuildConfig{
 		Name:     "freebsd-amd64-race",
-		HostType: "host-freebsd-11_1",
+		HostType: "host-freebsd-11_1-big",
 	})
 	addBuilder(BuildConfig{
 		Name:     "freebsd-386-10_3",