[cfe-dev] MSVC Ownership.h patch

[AlisdairM(public)]

Attached is a potential patch for fixing a move semantics bug with Visual Studio 2008 Express.  It needs a little attention before applying, not least a correct version check for the compiler.  However, I am uncomfortable about a couple of things.

i/ so far, no-one but me has reported the issue - is it something else with my setup?
ii/ ASTMultiPtr is not the only type using this idiom in this way, but is so far the only one needing patching.
iii/ Solving by casting could simply be hiding a deeper problem that the two types with the same name really are distinct to MSVC for some reason.
iv/ I don't like being the one to set a precedent of introducing compiler-specific fixes.
v/ This code is way too ugly to be used as mainline code, and kind of demands a version-specific check or dropping support for the compiler!

In the meantime, I propose to use this patch on my own system as it allows me to continue testing.
I'll take advice on whether/how it is worth cleaning up and applying to the trunk.

AlisdairM
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