public String getRegisterName(Address addr, int size) {
		Register reg = pcodelanguage.getRegister(addr, size);
		if (reg == null) {
			return "";
		}
		return reg.getName();
	}
Given a storage location, return the register name for that location, or null if there
is no register there.
@param addr is the starting address of the storage location
@param size is the size of storage in bytes
@return the register name or null
Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/DecompileCallback.java