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

pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart

Index: pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
diff --git a/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart b/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
index 111eb22d6c5dcc60c6693a0c821d08dd1d6a8d13..ca97a3a0f477af94029c82450d1a465676c39155 100644
--- a/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
+++ b/pkg/compiler/lib/src/js_backend/lookup_map_analysis.dart
@@ -307,7 +307,7 @@ class LookupMapAnalysis {
     // When --verbose is passed, we show the total number and set of keys that
     // were tree-shaken from lookup maps.
     Compiler compiler = backend.compiler;
-    if (compiler.verbose) {
+    if (compiler.options.verbose) {
       var sb = new StringBuffer();
       int count = 0;
       for (var info in _lookupMaps.values) {