Ignore setters in constructors when evaluating determining firect field access

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 df545511e8a36f4336fa1ce8e3f9e2d999ecbce3..e4fa84757ff696d3499d134da6b324fc9eed0d6e 100644
--- a/lib/compiler/implementation/ssa/codegen.dart
+++ b/lib/compiler/implementation/ssa/codegen.dart
@@ -1858,7 +1858,9 @@ class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
     buffer.add(name);
     Type type = node.receiver.propagatedType.computeType(compiler);
     if (type != null) {
-      world.registerFieldSetter(node.element.name, type);
+      if (!work.element.isGenerativeConstructorBody()) {
+        world.registerFieldSetter(node.element.name, type);
+      }
       backend.updateFieldIntegerSetters(node.element,
                                         node.value.isInteger());
     }