[PATCH] [ms-cxxabi] Construct and destroy call arguments in the correct order

[Reid Kleckner]

Hi rjmccall, rsmith,

MSVC destroys arguments in the callee from left to right.  Because C++
objects have to be destroyed in the reverse order of construction, clang
has to construct arguments from right to left and destroy arguments from
left to right.

This patch fixes the ordering by reversing the order of evaluation of
all call arguments under the MS C++ ABI.

Fixes PR18035.

http://llvm-reviews.chandlerc.com/D2275

Files:
  include/clang/Basic/TargetCXXABI.h
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGDecl.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/Sema/SemaChecking.cpp
  test/CodeGenCXX/microsoft-abi-arg-order.cpp
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