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

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

Index: pkg/compiler/lib/src/js_backend/constant_emitter.dart
diff --git a/pkg/compiler/lib/src/js_backend/constant_emitter.dart b/pkg/compiler/lib/src/js_backend/constant_emitter.dart
index 0550d8d1002f1e624c5b93a764b02d629d0f3771..9bb14173935072bc250e33954a1f2f295e9aa996 100644
--- a/pkg/compiler/lib/src/js_backend/constant_emitter.dart
+++ b/pkg/compiler/lib/src/js_backend/constant_emitter.dart
@@ -105,7 +105,7 @@ class ConstantEmitter
     // digits are lost anyway.
     String representation = primitiveValue.toString();
     String alternative = null;
-    int cutoff = compiler.enableMinification ? 10000 : 1e10.toInt();
+    int cutoff = compiler.options.enableMinification ? 10000 : 1e10.toInt();
     if (primitiveValue.abs() >= cutoff) {
       alternative = _shortenExponentialRepresentation(
           primitiveValue.toStringAsExponential());
@@ -133,7 +133,7 @@ class ConstantEmitter
 
   @override
   jsAst.Expression visitBool(BoolConstantValue constant, [_]) {
-    if (compiler.enableMinification) {
+    if (compiler.options.enableMinification) {
       if (constant.isTrue) {
         // Use !0 for true.
         return js("!0");