Move all flags to CompilerOptions (first step to stop passing the compiler to

pkg/dart2js_incremental/lib/caching_compiler.dart

Index: pkg/dart2js_incremental/lib/caching_compiler.dart
diff --git a/pkg/dart2js_incremental/lib/caching_compiler.dart b/pkg/dart2js_incremental/lib/caching_compiler.dart
index 4185df1c46b8be92bb1e72bc2a37a9d08b97cb64..f7f8f1004f69989bb05cf5484906e6d2f14a1834 100644
--- a/pkg/dart2js_incremental/lib/caching_compiler.dart
+++ b/pkg/dart2js_incremental/lib/caching_compiler.dart
@@ -36,11 +36,11 @@ Future<CompilerImpl> reuseCompiler(
   CompilerImpl compiler = cachedCompiler;
   if (compiler == null ||
       compiler.libraryRoot != libraryRoot ||
-      !compiler.hasIncrementalSupport ||
+      !compiler.options.hasIncrementalSupport ||
       compiler.hasCrashed ||
       compiler.enqueuer.resolution.hasEnqueuedReflectiveElements ||
       compiler.deferredLoadTask.isProgramSplit) {
-    if (compiler != null && compiler.hasIncrementalSupport) {
+    if (compiler != null && compiler.options.hasIncrementalSupport) {
       print('***FLUSH***');
       if (compiler.hasCrashed) {
         print('Unable to reuse compiler due to crash.');
@@ -57,12 +57,11 @@ Future<CompilerImpl> reuseCompiler(
         inputProvider,
         outputProvider,
         diagnosticHandler,
-        libraryRoot,
-        packageRoot,
-        options,
-        environment,
-        null,
-        null);
+        new CompilerOptions.parse(
+            libraryRoot: libraryRoot,
+            packageRoot: packageRoot,
+            options: options,
+            environment: environment));
     JavaScriptBackend backend = compiler.backend;
 
     full.Emitter emitter = backend.emitter.emitter;