Hi all,

For the past few weeks I have been working on some tests for TurboFan's
code generator. But sadly, it appears the x64 OSX buildbots are not
happy about them and I am having trouble reproducing the issue
locally. So far I've built V8 on a Macbook running 10.12.6 and the tests
are OK as far as I can see.

The CL in question is:
  https://chromium-review.googlesource.com/c/v8/v8/+/645868
And the failing bots:
- https://build.chromium.org/p/tryserver.v8/builders/v8_mac64_rel/builds/151
- https://build.chromium.org/p/tryserver.v8/builders/v8_mac64_dbg/builds/138
- 
https://build.chromium.org/p/tryserver.v8/builders/v8_mac64_asan_rel/builds/162

Is it possible to run the buildbot recipes locally?

For reference, the new tests target the `AssembleMove` and
`AssembleSwap` methods which generate native code to perform moves
generated by the gap resolver. In a nutshell, the tests generate stub
functions which allocate a lot of spill slots, perform a long list of
randomly generated moves on those slots, and then return. For the time
being, we only make sure that these functions execute. We've already
found a few bugs thanks to these tests.

The bots show a segfault, does this ring a bell to anybody? I'm not
familiar with OSX as a platform, maybe this is doing something forbidden
on this platform?

Thanks a lot,
Pierre

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