private void flowOverride(ProgramDB program, String description) {
		int txId = program.startTransaction(description);
		boolean commit = false;
		try {
			// Override flow as a CallReturn @ 0100354f.
			Instruction instruction =
				program.getListing().getInstructionAt(addr(program, "0100354f"));
			instruction.setFlowOverride(FlowOverride.CALL_RETURN);
			commit = true;
		}
		finally {
			program.endTransaction(txId, commit);
		}
		ReferenceManager refMgr = program.getReferenceManager();
		Reference[] referencesFrom = refMgr.getReferencesFrom(addr(program, "0100354f"), 1);
		assertEquals(0, referencesFrom.length);
	}
Override flow as a CallReturn @ 0100354f.
@param program override the flow in this program.
@param description description for the transaction that overrides the flow.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/CodeUnitMergeManagerOverrideTest.java