AppVeyor failure

[kinke via digitalmars-d-ldc]

> On Saturday, 13 August 2016 at 22:01:27 UTC, Joakim wrote:
>> On Saturday, 13 August 2016 at 17:31:03 UTC, Johan Engelen 
>> wrote:
>>> What happened with AppVeyor greenness?
>>>
>>> https://ci.appveyor.com/project/kinke/ldc/history
>>>
>>> The commit where red started seems totally unrelated to Win 
>>> code.
>>
>> Oh, heh, that would be me.  Core.thread is throwing an 
>> exception now, that makes no sense.  Feel free to revert my 
>> commit, see if that makes a difference.

dmd-testsuite shows some more failures/crashes for Win64: 
runnable/eh (RC 9), runnable/test4 (RC 5), runnable/testdstress 
(RC 9), for both debug and release.

The x86 job is still green. Changing the D compiler to DMD (as 
used by the x86 job) doesn't help. I still can't reproduce it on 
my box - up-to-date Win10, VS 2015 Update 3, latest LLVM 3.9.  
Running out of ideas...