[FixCode] Don't add .dynamicType

Adding .dynamicType interacts poorly with the swift migrator by
invalidating some inits with type errors.

rdar://problem/26642062

lib/FrontendTool/FrontendTool.cpp

@@ -580,6 +580,10 @@ private:
         Info.ID == diag::invalid_ibinspectable.ID ||
         Info.ID == diag::invalid_ibaction_decl.ID)
       return false;
+    // Adding .dynamicType interacts poorly with the swift migrator by
+    // invalidating some inits with type errors.
+    if (Info.ID == diag::init_not_instance_member.ID)
+      return false;
 
     if (Kind == DiagnosticKind::Error)
       return true;

test/FixCode/fixits-apply.swift

@@ -197,3 +197,10 @@ protocol NonObjCProtocol {}
 @IBDesignable extension SomeProt {}
 
 func attrNowOnType(@noescape foo: ()->()) {}
+
+class InitDynType {
+  init() {}
+  func notInit() {
+    self.init()
+  }
+}

test/FixCode/fixits-apply.swift.result

@@ -200,3 +200,10 @@ protocol NonObjCProtocol {}
 @IBDesignable extension SomeProt {}
 
 func attrNowOnType(foo: @noescape ()->()) {}
+
+class InitDynType {
+  init() {}
+  func notInit() {
+    self.init()
+  }
+}