recent libcxx regression

[G M]

On attempting to rebuild libcxx after a recent clang/llvm and libcxx svn
update, I am now seeing this error using a mingw 64 compiled clang++ on
Windows 7 64 machine.

clang++.exe -fno-exceptions -Ic:/libcxx/include -c c:/libcxx/src/thread.cpp
In file included from c:/libcxx/src/thread.cpp:27:
In file included from
c:\mingw\bin\..\lib\clang\3.5.0\../../../x86_64-w64-mingw32/include\windows.h:69:
In file included from
c:\mingw\bin\..\lib\clang\3.5.0\../../../x86_64-w64-mingw32/include\windef.h:8:
In file included from
c:\mingw\bin\..\lib\clang\3.5.0\../../../x86_64-w64-mingw32/include\minwindef.h:146:
c:\mingw\bin\..\lib\clang\3.5.0\../../../x86_64-w64-mingw32/include\winnt.h:1495:11:
fatal error: 'x86intrin.h' file not
      found
# include <x86intrin.h>
I note that thread.cpp itself doesn't show a recent change that in of
itself that would appear to be the culprit. Not to say that that means it
could not have a problem that was just exposed by another change.

I don't have time to track this further right now. Hope this helps in the
mean time.
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