[PATCH] [MSVC2012] Allow 'mutable' references (fix for http://llvm.org/PR22444)

[Reid Kleckner]

In http://reviews.llvm.org/D7370#117647, @thakis wrote:

> Out of interest, which header file? We are able to parse all of Chromium
>  with MSVC2012 a while ago, and that uses lots of Windows headers.


Chromium doesn't use C++11 library features like <future>, which tend to pull in other ConCRT headers that we aren't testing yet.


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http://reviews.llvm.org/D7370

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