add #ifndef NDEBUG

Author: ktoso

lib/Sema/TypeCheckAttr.cpp

@@ -51,12 +51,14 @@ namespace {
     assert(!D->hasClangNode() && "Clang importer propagated a bogus attribute");
     if (!D->hasClangNode()) {
       SourceLoc loc = attr->getLocation();
+#ifndef NDEBUG
       if (!loc.isValid()) {
         llvm::errs() << "Attribute '";
         attr->print(llvm::errs());
         llvm::errs() << "' has invalid location, failed to diagnose!\n";
         assert(false && "Diagnosing attribute with invalid location");
       }
+#endif
       if (loc.isInvalid()) {
         loc = D->getLoc();
       }