Track discriminators for closure expressions.

Swift SVN r10905

lib/Parse/ParseDecl.cpp

@@ -467,13 +467,13 @@ void Parser::consumeDecl(ParserPosition BeginParserPosition, unsigned Flags,
 
 void Parser::setLocalDiscriminator(ValueDecl *D) {
   // If we're not in a local context, this is unnecessary.
-  if (!LocalDiscriminators) return;
+  if (!CurFunction) return;
 
   Identifier name = D->getName();
   assert(!name.empty() &&
          "setting a local discriminator on an anonymous decl; "
          "maybe the name hasn't been set yet?");
-  unsigned discriminator = (*LocalDiscriminators)[name]++;
+  unsigned discriminator = CurFunction->LocalDiscriminators[name]++;
   D->setLocalDiscriminator(discriminator);
 }