Reapply r359778: [clangd] Fix code completion of macros defined in the preamble region of the main file.
The bad assert has been removed, and updateOutOfDateIdentifier has been guarded.
This reverts commit r359796.
llvm-svn: 359799
diff --git a/clang-tools-extra/clangd/index/SymbolCollector.cpp b/clang-tools-extra/clangd/index/SymbolCollector.cpp
index 05e2c5c..b9f3217 100644
--- a/clang-tools-extra/clangd/index/SymbolCollector.cpp
+++ b/clang-tools-extra/clangd/index/SymbolCollector.cpp
@@ -24,6 +24,7 @@
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Specifiers.h"
#include "clang/Index/IndexSymbol.h"
+#include "clang/Index/IndexingAction.h"
#include "clang/Index/USRGeneration.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/Support/Casting.h"