runtime/race: implement race detector for ppc64le

[laboger]

What version of Go are you using (go version)?

Planned for go 1.11

What operating system and processor architecture are you using (go env)?

ppc64le any distro

/cc @dvyukov

[laboger]

@ceseo and I are working on this, we can build golang and get the race tests to pass but now trying to get the LLVM code upstream.

[laboger]

I have the golang changes, still waiting for the latest LLVM code to be submitted upstream so the syso can be built for ppc64le. (TSAN already works on ppc64le with Clang.)

[ceseo]

@laboger LLVM changes merged into revision 330122.

You can proceed with your changes.

[laboger]

We need to understand how to get the syso file built so it can be added to the runtime/race directory.

[gopherbot]

Change https://golang.org/cl/107935 mentions this issue: runtime/race: implement race detector for ppc64le

[gopherbot]

Change https://golang.org/cl/112881 mentions this issue: cmd/racebuild: add linux/ppc64le

[laboger]

This is in.