PPC/s390: modify if/else block to fix debug build

changed the if/else block to fix the debug build
failure on PPC/s390.

R=adamk@chromium.org, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/1941683003
Cr-Commit-Position: refs/heads/master@{#35954}

src/parsing/preparser.cc

@@ -285,7 +285,7 @@ PreParser::Statement PreParser::ParseScopedStatement(bool legacy, bool* ok) {
   } else {
     Scope* body_scope = NewScope(scope_, BLOCK_SCOPE);
     BlockState block_state(&scope_, body_scope);
-    return ParseFunctionDeclaration(CHECK_OK);
+    return ParseFunctionDeclaration(ok);
   }
 }