[FixCode] Add another case of inserting ';' to the ban list

We missed one of the fixits that insert ; separators.

rdar://problem/26681061

Author: benlangmuir

lib/FrontendTool/FrontendTool.cpp

@@ -556,6 +556,7 @@ class JSONFixitWriter : public DiagnosticConsumer {
 
     // Do not add a semi or comma as it is wrong in most cases during migration
     if (Info.ID == diag::statement_same_line_without_semi.ID ||
+        Info.ID == diag::declaration_same_line_without_semi.ID ||
         Info.ID == diag::expected_separator.ID)
       return false;
     // The following interact badly with the swift migrator, they are undoing

test/FixCode/fixits-apply.swift

@@ -204,3 +204,8 @@ class InitDynType {
     self.init()
   }
 }
+
+class NoSemi {
+  enum Bar { case bar }
+  var foo: .Bar = .bar
+}

test/FixCode/fixits-apply.swift.result

@@ -207,3 +207,8 @@ class InitDynType {
     self.init()
   }
 }
+
+class NoSemi {
+  enum Bar { case bar }
+  var foo: .Bar = .bar
+}