Remove 'using namespace llvm;' from Internals.h and deal with the fallout.  This
is a step towards gcc-4.8 support. Note that changing dyn_cast to llvm::dyn_cast
is needed when compiling against gcc-4.8 since it has its own dyn_cast. Patch by
Peter Collingbourne.


git-svn-id: https://llvm.org/svn/llvm-project/dragonegg/trunk@178533 91177308-0d34-0410-b5e6-96231b3b80d8