Add support for profile-based startup optimizations.

pkg/compiler/lib/src/commandline_options.dart

Index: pkg/compiler/lib/src/commandline_options.dart
diff --git a/pkg/compiler/lib/src/commandline_options.dart b/pkg/compiler/lib/src/commandline_options.dart
index c3195f0b6d9f3139738aa1d1f24fb48af3ccd876..dd0a01ee0af9927c88c6ce39a6584257592c9248 100644
--- a/pkg/compiler/lib/src/commandline_options.dart
+++ b/pkg/compiler/lib/src/commandline_options.dart
@@ -23,6 +23,10 @@ class Flags {
   static const String enableDiagnosticColors = '--enable-diagnostic-colors';
   static const String enableExperimentalMirrors =
       '--enable-experimental-mirrors';
+  static const String experimentalTrackAllocations =
+      '--experimental-track-allocations';
+  static const String experimentalAllocationsPath =
+      '--experimental-allocations-path';
   static const String fastStartup = '--fast-startup';
   static const String fatalWarnings = '--fatal-warnings';
   static const String generateCodeWithCompileTimeErrors =