Merging r245084:

Merging r245084:
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r245084 | martell | 2015-08-14 12:05:56 -0700 (Fri, 14 Aug 2015) | 13 lines

WindowsX86: long double is x87DoubleExtended on mingw

    Summary:
    long double on x86 mingw is 80bits and is aligned to 16bytes

	Fixes:
    https://llvm.org/bugs/show_bug.cgi?id=24398

    Reviewers: rnk

    Subscribers: cfe-commits

    Differential Revision: http://reviews.llvm.org/D12037
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_37@245456 91177308-0d34-0410-b5e6-96231b3b80d8