private void setFallthroughOverride(boolean state) {
		if (state != isFallThroughOverridden()) {
			if (state) {
				flags |= FALLTHROUGH_SET_MASK;
			}
			else {
				flags &= FALLTHROUGH_CLEAR_MASK;
			}
			codeMgr.setFlags(addr, flags);
			program.setChanged(ProgramEvent.FALLTHROUGH_CHANGED, address, address, null, null);
		}
	}
Clear all existing fall-through references from address.
@param keepFallThroughAddr if not null, corresponding fall-through reference will be 
preserved.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/InstructionDB.java