Remove dart_noopt and related parts from the VM.

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
diff --git a/runtime/vm/flow_graph_compiler.cc b/runtime/vm/flow_graph_compiler.cc
index d0a2cb111a7dd28f46566cfbba225f2312a49b26..2ab89c18385195dcac096b510b7c5fd591b53f3c 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -90,7 +90,8 @@ static void PrecompilationModeHandler(bool value) {
     FLAG_unbox_numeric_fields = false;
 
 #if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
-    // Set flags affecting runtime accordingly for dart_noopt.
+    // Set flags affecting runtime accordingly for dart_bootstrap.
+    // These flags are constants with PRODUCT and DART_PRECOMPILED_RUNTIME.
     FLAG_collect_code = false;
     FLAG_support_debugger = false;
     FLAG_deoptimize_alot = false;  // Used in some tests.