Refactor the collection of initializer list types

lib/compiler/implementation/ssa/codegen.dart

Index: lib/compiler/implementation/ssa/codegen.dart
diff --git a/lib/compiler/implementation/ssa/codegen.dart b/lib/compiler/implementation/ssa/codegen.dart
index 258a85b6aca743042f8034e0757249a61b46567b..9e3578af3ae2e1c719a0862daf9dcf87af1bc557 100644
--- a/lib/compiler/implementation/ssa/codegen.dart
+++ b/lib/compiler/implementation/ssa/codegen.dart
@@ -1736,9 +1736,10 @@ class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
       buffer.add(name);
       Type type = node.receiver.propagatedType.computeType(compiler);
       if (type != null) {
-        world.registerFieldSetter(node.element.name,
-                                  type,
-                                  node.value.isInteger());
+        world.registerFieldSetter(node.element.name, type);
+        backend.updateFieldIntegerSetters(type,
+                                          node.element.name,
+                                          node.value.isInteger());
       }
     } else {
       declareInstruction(node.receiver);
@@ -1773,10 +1774,9 @@ class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
       includeBackendMembers: true,
       includeSuperMembers: true,
       f: (ClassElement enclosingClass, Element member) {
-        world.registerFieldInitializer(member.name,
-                                       enclosingClass.computeType(compiler),
-                                       node.inputs[i].isInteger());
-
+        backend.updateFieldInitializers(enclosingClass.computeType(compiler),
+                                        member.name,
+                                        node.inputs[i].propagatedType);
         i++;
       });
     String jsClassReference = compiler.namer.isolateAccess(node.element);