runtime/race: update syso files

[dvyukov]

We need to update syso race files to HEAD.
It will fix #20139.
There is also outstanding netbsd support (#24322) which requires regeneration of syso files. And PPC support (#23731), not yet ready, but it would be good repair ability to update syso files.
And generally just to have fresh supported code.

Probably also need to add netbsd support to racebuild here:
https://github.com/golang/build/blob/master/cmd/racebuild/racebuild.go
(mostly copy-paste from freebsd I guess).

The last time I checked racebuild it was broken with some error, but now it fails earlier asking for some auth token which I don't have.

@bradfitz @josharian @krytarowski

[krytarowski]

I'm using a prebuilt toolchain stored in:

http://cdn.netbsd.org/pub/NetBSD/misc/kamil/llvm-clang-compilerrt-lldb-7.0.0beta_2018-02-28.tar.bz2

Generated on NetBSD/8.9.12. It contains the pristine sources from HEAD of Clang, LLVM, LLDB, compiler-rt patched with around 1500 lines of local diffs that is still not cleaned up and upstreamed. [to be clear: local patches are mainly with interceptors for MSan, nothing in particular pending for TSan]

We will need to redo the same for Memory Sanitizer in Go on NetBSD/amd64, as it's already stable enough and works for C and C++ programs.

[laboger]

@ceseo needs to push a change upstream for LLVM on ppc64le for Go. We have some internal users testing it.

[dvyukov]

FTR, here is an attempt to fix racebuild:
https://go-review.googlesource.com/c/build/+/101137

[ceseo]

@laboger done. It's in revision 330122.

[krytarowski]

Is there need for changes in NetBSD Go files?

[dvyukov]

@krytarowski changes are needed in multiple places (e.g. adding support for netbsd to buildgo.sh in llvm repo, to go tool to accept -race flag on netbsd, to racebuild.go to build runtime on netbsd). They probably will be mostly "doing the same as freebsd", but still somebody needs to do them and then do testing.

[laboger]

@dvyukov I'm not sure of the order in which I submit my changes to add support for ppc64le. The code in x/build/cmd/racebuild/racebuild.go expects that the golang race support is there with the -race flag enabled, but it won't build if it doesn't have the syso file.

[laboger]

And I don't know how to run something with gomote to test the change to build the syso file.

[dvyukov]

@laboger I think it would be a good start to prepare all required changes in a single change (except for racebuild.go because you can't test it and because it's in a different repository). Then we can figure out how to split them. It will be easier when we can see all required changes.

[krytarowski]

Last time I was told that someone internal shall add the files, generate -race files etc. I can help to configure a NetBSD VM and instruct to build compiler-rt, is this enough?

[bradfitz]

We have NetBSD VMs. We just need instructions.

Here are the instructions in x/build/cmd/racebuild for all the other OSes:

https://github.com/golang/build/blob/master/cmd/racebuild/racebuild.go#L62