Add FrontendStrategy.commonElements and remove Backend.commonElements

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

Index: pkg/compiler/lib/src/ssa/rasta_ssa_builder_task.dart
diff --git a/pkg/compiler/lib/src/ssa/rasta_ssa_builder_task.dart b/pkg/compiler/lib/src/ssa/rasta_ssa_builder_task.dart
index 7a687dda9cf31d1967214d2e2780bf15995107d0..002d20422b1a6088cb088d6e8d0c2b01d895b97c 100644
--- a/pkg/compiler/lib/src/ssa/rasta_ssa_builder_task.dart
+++ b/pkg/compiler/lib/src/ssa/rasta_ssa_builder_task.dart
@@ -23,7 +23,7 @@ class RastaSsaBuilderTask extends SsaAstBuilderBase {
 
   HGraph build(ElementCodegenWorkItem work, ClosedWorld closedWorld) {
     return measure(() {
-      if (handleConstantField(work)) {
+      if (handleConstantField(work, closedWorld)) {
         // No code is generated for `work.element`.
         return null;
       }