cmd/racebuild: add linux/ppc64le

Updates golang/go#19273.
Updates golang/go#24354.
Updates golang/go#23731.

Change-Id: Iad8870b265e7e3b56b5219d3367ccef70dcc0679
Reviewed-on: https://go-review.googlesource.com/112881
Reviewed-by: Brad Fitzpatrick <[email protected]>

Author: Bryan C. Mills

cmd/racebuild/racebuild.go

@@ -79,6 +79,23 @@ cp compiler-rt/lib/tsan/go/race_linux_amd64.syso go/src/runtime/race
 (cd go/src && ./race.bash)
 			`,
 	},
+	&Platform{
+		OS:   "linux",
+		Arch: "ppc64le",
+		Type: "linux-ppc64le-buildlet",
+		Script: `#!/usr/bin/env bash
+set -e
+apt-get update
+apt-get install -y git g++
+git clone https://go.googlesource.com/go
+git clone http://llvm.org/git/compiler-rt.git
+(cd compiler-rt && git checkout $REV)
+(cd compiler-rt/lib/tsan/go && ./buildgo.sh)
+cp compiler-rt/lib/tsan/go/race_linux_ppc64le.syso go/src/runtime/race
+# TODO(#23731): Uncomment to test the syso file before accepting it.
+# (cd go/src && ./race.bash)
+			`,
+	},
 	&Platform{
 		OS:   "netbsd",
 		Arch: "amd64",