Fix messed up indentation in TypeCheckMacros.cpp

Author: rxwei

lib/Parse/ParseDecl.cpp

@@ -4768,7 +4768,7 @@ bool Parser::isStartOfSwiftDecl(bool allowPoundIfAttributes) {
   // Skip a #if that contains only attributes in all branches. These will be
   // parsed as attributes of a declaration, not as separate declarations.
   if (Tok.is(tok::pound_if) && allowPoundIfAttributes) {
-      BacktrackingScope backtrack(*this);
+    BacktrackingScope backtrack(*this);
     bool sawAnyAttributes = false;
     return skipIfConfigOfAttributes(sawAnyAttributes) &&
         (Tok.is(tok::eof) || (sawAnyAttributes && isStartOfSwiftDecl()));