Mangle Objective-C pointers and block pointers in the Microsoft C++ Mangler.

Mangle Objective-C pointers and block pointers in the Microsoft C++ Mangler.

ObjC pointers were easy enough (as far as the ABI is concerned, they're
just pointers to structs), but I had to invent a new mangling for block
pointers. This is particularly worrying with the Microsoft ABI, because
it is a vendor-specific ABI; extending it could come back to bite us
later when MS extends it on their own (and you know they will).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107572 91177308-0d34-0410-b5e6-96231b3b80d8