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

pkg/compiler/lib/src/ssa/codegen_helpers.dart

Index: pkg/compiler/lib/src/ssa/codegen_helpers.dart
diff --git a/pkg/compiler/lib/src/ssa/codegen_helpers.dart b/pkg/compiler/lib/src/ssa/codegen_helpers.dart
index a68f70b77b486af287b41ce664996b7ee1b464cb..beb4f42206732fa5e0dfea69edb86cd0a18e049a 100644
--- a/pkg/compiler/lib/src/ssa/codegen_helpers.dart
+++ b/pkg/compiler/lib/src/ssa/codegen_helpers.dart
@@ -291,7 +291,7 @@ class SsaTrustedCheckRemover extends HBaseVisitor {
   SsaTrustedCheckRemover(this.compiler);
 
   void visitGraph(HGraph graph) {
-    if (!compiler.trustPrimitives) return;
+    if (!compiler.options.trustPrimitives) return;
     visitDominatorTree(graph);
   }