8244724: CTW: C2 compilation fails with "Live Node limit exceeded limit"

Fix live limit assert in node construction to be ignored during code generation in Compile::Code_Gen().

Reviewed-by: kvn, neliasso

src/hotspot/share/opto/compile.cpp

@@ -1013,6 +1013,7 @@ void Compile::Init(int aliaslevel) {
   register_library_intrinsics();
 #ifdef ASSERT
   _type_verify_symmetry = true;
+  _phase_optimize_finished = false;
 #endif
 }
 
@@ -2249,6 +2250,7 @@ void Compile::Optimize() {
  }
 
  print_method(PHASE_OPTIMIZE_FINISHED, 2);
+ DEBUG_ONLY(set_phase_optimize_finished();)
 }
 
 //---------------------------- Bitwise operation packing optimization ---------------------------