Added "long long" and "unsigned long long" to the TestBasicTypes.py.

Added a special "clean" target to the types/Makefile to clean up all the *.o/.d
files.

The generic_type_tester() method is modified to take a set of atoms, instead of
type string as a required parameter, for example:

o unsigned int => set(['unsigned', 'int'])
o unsigned long long => set(['unsigned', 'long long'])
o long long => set(['long long'])

llvm-svn: 114871