libIRDB IR-builder separation from BEA

.gitattributes

libIRDB/include/decode/decode.hpp

libIRDB/include/decode/operand.hpp

libIRDB/include/libIRDB-decode.hpp

libIRDB/src/SConscript

libIRDB/src/decode/SConscript

libIRDB/src/decode/decode.cpp

libIRDB/src/decode/operand.cpp

libIRDB/test/SConscript

libIRDB/test/fill_in_cfg.cpp

libIRDB/test/fill_in_indtargs.cpp

libIRDB/test/split_eh_frame.cpp