llvm-base: Don't declare DbgInfoPrinter pass with LLVM 3.3

Keeps consistency between extra.cpp & extra.h
This should have been included in:
d01855daab68727da55db94d35fa8b620dd485d0
Merge pull request #52 from olajep/fix-extra

llvm-base: Don't declare DbgInfoPrinter pass with LLVM 3.3
llvm-base: Fix compiler warnings.
Merge pull request #54 from olajep/fix-macro-redef-warnings

llvm-base: Fix compiler warnings.
llvm-base: Move all pass declarations to passes-inl.h

Keep one list of pass declarations and definitions in passes-inl.h
Before, we had one list of definitions in extra.cpp and one list of
declarations in extra.h.

When passes-inl.h is included from extra.h the declare_or_define macro
will expand the passes to function declarations.

When passes-inl.h is included from extra.cpp the declare_or_define macro
will expand the passes to function definitions.
Don't track files generated when examples are built
Merge pull request #53 from olajep/extra-consistency

llvm-base: Move all pass declarations to passes-inl.h
Merge pull request #55 from olajep/gitignore-examples

Don't track files generated when examples are built