Auto-apply the new generic parameter fix-it during migration.

Last bit of rdar://problem/27087345.

Author: jrose-apple

lib/FrontendTool/FrontendTool.cpp

@@ -650,7 +650,8 @@ class JSONFixitWriter : public DiagnosticConsumer {
         Info.ID == diag::deprecated_protocol_composition.ID ||
         Info.ID == diag::deprecated_protocol_composition_single.ID ||
         Info.ID == diag::deprecated_any_composition.ID ||
-        Info.ID == diag::deprecated_operator_body.ID)
+        Info.ID == diag::deprecated_operator_body.ID ||
+        Info.ID == diag::unbound_generic_parameter_explicit_fix.ID)
       return true;
 
     return false;

test/FixCode/fixits-apply.swift

@@ -189,6 +189,7 @@ var graph: Graph3
 
 class Graph4<NodeType : SomeProt> {}
 var graph: Graph4
+var graphAgain = Graph4()
 
 class GraphCombo<NodeType : SomeProt & ObjCProt> {}
 var graph: GraphCombo

test/FixCode/fixits-apply.swift.result

@@ -192,6 +192,7 @@ var graph: Graph3<ObjCProt>
 
 class Graph4<NodeType : SomeProt> {}
 var graph: Graph4<<#NodeType: SomeProt#>>
+var graphAgain = Graph4<<#NodeType: SomeProt#>>()
 
 class GraphCombo<NodeType : SomeProt & ObjCProt> {}
 var graph: GraphCombo<<#NodeType: ObjCProt & SomeProt#>>