DFGBase specializations in different namespaces

[Michael Haidl]

I recently updated RV to the latest commit and the following errors occurred:

llvm/tools/rv/src/analysis/DFG.cpp:11:53: error: specialization of ‘template<bool backward> bool llvm::DFGBaseWrapper<backward>::runOnFunction(llvm::Function&)’ in different namespace [-fpermissive]
 bool DFGBaseWrapper<true>::runOnFunction(Function& F)

...

I reverted our custom port to LLVM 6.0 since I got a linker error and the original code is now compatible with the LLVM 6.0 API.

The compile error can be fixed in DFG.cpp by pulling everything into the llvm namespace. However, I was wondering if DFGBase should realy live in the llvm namespace.

[Simon Moll]

fixed by fee2427