HandleLLVMOptions.cmake: Typo, s/proerty/property/

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AddLLVM.cmake: Untabify.

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[CMake] Move libgtest for external projects.

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llvm/tools: Prune redundant target_link_libraries.

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LTO itself hasn't depended on MCDisassembler any more.

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[ms-cxxabi] Add a new calling convention that swaps 'this' and 'sret'

MSVC always places the 'this' parameter for a method first.  The
implicit 'sret' pointer for methods always comes second.  We already
implement this for __thiscall by putting sret parameters on the stack,
but __cdecl methods require putting both parameters on the stack in
opposite order.

Using a special calling convention allows frontends to keep the sret
parameter first, which avoids breaking lots of assumptions in LLVM and
Clang.

Fixes PR15768 with the corresponding change in Clang.

Reviewers: ributzka, majnemer

Differential Revision: http://llvm-reviews.chandlerc.com/D2663

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