[PATCH] Fix stack overflow in MSVC unqualified type lookup logic

[Will Wilson via cfe-commits]

Hi Alexey,

A customer encountered a stack overflow in the code from r229817. I've
created a small repro for testing the issue and a fix. The fix should also
better deal with lookup into partially specialized base templates.

Test case included and tested against latest trunk.

Let me know if it looks acceptable!

Cheers,
Will.

-- 
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