[fixcode] Enabled protocol<...> fixits

The old syntax is deprecated in swift 3, and these fixits seem quite
safe, so apply them for migration.

rdar://problem/27794981

Author: benlangmuir

lib/FrontendTool/FrontendTool.cpp

@@ -635,7 +635,10 @@ class JSONFixitWriter : public DiagnosticConsumer {
         Info.ID == diag::selector_construction_suggest.ID ||
         Info.ID == diag::selector_literal_deprecated_suggest.ID ||
         Info.ID == diag::attr_noescape_deprecated.ID ||
-        Info.ID == diag::attr_autoclosure_escaping_deprecated.ID)
+        Info.ID == diag::attr_autoclosure_escaping_deprecated.ID ||
+        Info.ID == diag::deprecated_protocol_composition.ID ||
+        Info.ID == diag::deprecated_protocol_composition_single.ID ||
+        Info.ID == diag::deprecated_any_composition.ID)
       return true;
 
     return false;

test/FixCode/fixits-apply.swift

@@ -236,3 +236,9 @@ enum E {
   case abc
 }
 func testEnumRename() { _ = E.Abc }
+
+func testProtocolCompositionSyntax() {
+  var _: protocol<>
+  var _: protocol<Prot1>
+  var _: protocol<Prot1, Prot2>
+}

test/FixCode/fixits-apply.swift.result

@@ -239,3 +239,9 @@ enum E {
   case abc
 }
 func testEnumRename() { _ = E.Abc }
+
+func testProtocolCompositionSyntax() {
+  var _: Any
+  var _: Prot1
+  var _: Prot1 & Prot2
+}