[PATCH] Don't dllimport/export destructor variants implemented by thunks.

[Hans Wennborg]

Hi rnk, nrieck,

MSVC doesn't export these functions, so trying to import them doesn't work.
Also, don't let any dll attributes on the CXXDestructorDecl influence the
thunk's linkage -- it should always be linkonce_odr.

This takes care of the FIXME's for this in Nico's tests.

http://reviews.llvm.org/D3930

Files:
  lib/CodeGen/CodeGenModule.cpp
  test/CodeGenCXX/dllimport-members.cpp
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