Remove MemoryPlan from VM passes (apache#7361)

Author: Matthew Brookhart

src/relay/backend/vm/compiler.cc

@@ -985,8 +985,11 @@ transform::Sequential MemoryOpt(tvm::Target host_target, TargetsMap targets) {
   // Fuse the shape functions.
   pass_seqs.push_back(transform::FuseOps());
 
-  // Perform memory planning in order to coalesce/reduce allocations.
-  pass_seqs.push_back(transform::MemoryPlan());
+  // TODO(mbrookhart, jroesch, masahi): this pass is very slow, and is
+  // incomplete to provide memory resuse optimizations. Disable it until we can
+  // rewrite it in C++ and complete it.
+  // // Perform memory planning in order to coalesce/reduce allocations.
+  // pass_seqs.push_back(transform::MemoryPlan());
 
   // Compute away constant computation introduced by coalescing allocations.
   pass_seqs.push_back(transform::FoldConstant());

src/relay/backend/vm/lambda_lift.cc

@@ -192,7 +192,6 @@ class LambdaLifter : public ExprMutator {
       global = module_->GetGlobalVar(name);
     } else {
       // Add the lifted function to the module.
-      std::cout << AsText(lifted_func) << std::endl;
       module_->Add(global, lifted_func);
     }