[PATCH] Removing a disabled warning

[Aaron Ballman]

We disabled this warning previously because tablegen would generate
empty case statements with nothing but a default label.  However,
having taught tablegen not to do that, and removed the small number of
other cases doing this, we now compile without generating this warning
in MSVC.

This patch re-renables C4065 (switch statement contains 'default' but
no 'case' labels).

~Aaron
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