code cleanups to avoid register name conflict with system headers

libMEDSannotation/include/MEDS_FuncPrototypeAnnotation.hpp

libMEDSannotation/include/MEDS_Register.hpp

libMEDSannotation/src/MEDS_FPTRShadowAnnotation.cpp

libMEDSannotation/src/MEDS_InstructionCheckAnnotation.cpp

libMEDSannotation/src/MEDS_Register.cpp

libtransform/src/integertransform32.cpp

libtransform/src/integertransform64.cpp

libtransform/src/leapattern.cpp

libtransform/src/transform.cpp

tools/cookbook/SConscript

tools/fptr_shadow/fptr_shadow_instrument64.cpp

tools/meds2pdb/meds2pdb.cpp

tools/spasm/spasm.cpp

tools/transforms/SConscript