Sema: Fix -Wsometimes-uninitialized warning

Author: AnthonyLatsis

lib/Sema/MiscDiagnostics.cpp

@@ -6808,7 +6808,7 @@ TypeChecker::omitNeedlessWords(AbstractFunctionDecl *afd) {
   // Handle contextual type, result type, and returnsSelf.
   Type contextType = afd->getDeclContext()->getDeclaredInterfaceType();
   Type resultType;
-  bool returnsSelf;
+  bool returnsSelf = false;
 
   if (auto func = dyn_cast<FuncDecl>(afd)) {
     resultType = func->getResultInterfaceType();