Lab6: Implement DominatorTree-based natural loop discovery and loop-invariant code motion hoisting pass

src/ir/passes/PassManager.cpp

@@ -4,13 +4,11 @@
 namespace ir {
 
 void RunFunctionOptimizationPasses(Function* func, Context& ctx) {
-  // 1. Promote memory-based local variables to SSA form using Mem2Reg
   RunMem2Reg(func, ctx);
 
-  // 2. Run scalar optimizations iteratively until convergence (no changes observed)
   bool changed = true;
   int iterations = 0;
-  const int max_iterations = 16; // Safe limit to prevent compile-time infinite loops
+  const int max_iterations = 16;
 
   while (changed && iterations < max_iterations) {
     changed = false;
@@ -19,6 +17,7 @@ void RunFunctionOptimizationPasses(Function* func, Context& ctx) {
     changed |= RunConstProp(func, ctx);
     changed |= RunConstFold(func, ctx);
     changed |= RunCSE(func);
+    changed |= RunLICM(func);
     changed |= RunDCE(func);
     changed |= RunCFGSimplify(func);
   }