[PATCH] Remove some template instantiations to reduce the number of symbols.

[Reid Kleckner]

MinGW doesn't support anything like /bigobj, so I think we need this or something like it.
http://stackoverflow.com/questions/16596876/object-file-has-too-many-sections

I wonder if putting LLVM_ATTRIBUTE_ALWAYS_INLINE on all IntrusiveRefCntPtr methods would also help reduce the section count.

http://reviews.llvm.org/D5072