sal: allow register sets to overlap

This allows a register to be a member of multiple UniformRegisterSets.
Needed to architecture-specifically store, e.g., a list of registers to
record in traces.

Change-Id: Ia5d20768540efe252a84df967d43e569f107da3a

src/core/sal/CPU.hpp

@@ -73,7 +73,7 @@ protected:
 	 * @param reg a pointer to the register object to be added
 	 * @see getType()
 	 */
-	void m_addRegister(Register* reg);
+	void m_addRegister(Register* reg, RegisterType type = RT_NONE);
 };
 
 } // end-of-namespace: fail