[clangd] Fix compilation of IndexBenchmark

llvm-svn: 347566
diff --git a/clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp b/clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp
index 04c3b57..baedca2 100644
--- a/clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp
+++ b/clang-tools-extra/clangd/benchmarks/IndexBenchmark.cpp
@@ -27,11 +27,11 @@
 namespace {
 
 std::unique_ptr<SymbolIndex> buildMem() {
-  return loadIndex(IndexFilename, {}, false);
+  return loadIndex(IndexFilename, /*UseDex=*/false);
 }
 
 std::unique_ptr<SymbolIndex> buildDex() {
-  return loadIndex(IndexFilename, {}, true);
+  return loadIndex(IndexFilename, /*UseDex=*/true);
 }
 
 // Reads JSON array of serialized FuzzyFindRequest's from user-provided file.