* Init 'then' and 'else' blocks for 'if' instruction.
*/
private static void initBlocksInIfNodes(BlockNode block) {
List<InsnNode> instructions = block.getInstructions();
if (instructions.size() == 1) {
InsnNode insn = instructions.get(0);
if (insn.getType() == InsnType.IF) {
((IfNode) insn).initBlocks(block);
}
}
}