SourceKit: Register type checker request functions

Some requests are implemented in lib/Sema/, even if they don't require a
LazyResolver. Be sure to register their request functions in SourceKit so
that these requests can be kicked off when needed.

Author: slavapestov

tools/SourceKit/lib/SwiftLang/SwiftEditor.cpp

@@ -706,6 +706,8 @@ class SwiftDocumentSyntaxInfo {
                      CompInv.getMainFileSyntaxParsingCache())
     );
 
+    registerTypeCheckerRequestFunctions(
+        Parser->getParser().Context.evaluator);
     Parser->getDiagnosticEngine().addConsumer(DiagConsumer);
 
     // Collecting syntactic information shouldn't evaluate # conditions.