[clang-tools-extra] Add #include <optional> (NFC)

This patch adds #include <optional> to those files containing
llvm::Optional<...> or Optional<...>.

I'll post a separate patch to actually replace llvm::Optional with
std::optional.

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

3 files changed, 3 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-query/Query.cpp b/clang-tools-extra/clang-query/Query.cpp
index 4d62f37231b7..d1db851c1297 100644
--- a/clang-tools-extra/clang-query/Query.cpp
+++ b/clang-tools-extra/clang-query/Query.cpp
@@ -14,6 +14,7 @@
 #include "clang/Frontend/TextDiagnostic.h"
 #include "clang/Tooling/NodeIntrospection.h"
 #include "llvm/Support/raw_ostream.h"
+#include <optional>
 
 using namespace clang::ast_matchers;
 using namespace clang::ast_matchers::dynamic;
diff --git a/clang-tools-extra/clang-query/QueryParser.cpp b/clang-tools-extra/clang-query/QueryParser.cpp
index b80ad04726bc..77621d252aed 100644
--- a/clang-tools-extra/clang-query/QueryParser.cpp
+++ b/clang-tools-extra/clang-query/QueryParser.cpp
@@ -14,6 +14,7 @@
 #include "clang/Tooling/NodeIntrospection.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
+#include <optional>
 #include <set>
 
 using namespace llvm;
diff --git a/clang-tools-extra/clang-query/tool/ClangQuery.cpp b/clang-tools-extra/clang-query/tool/ClangQuery.cpp
index 2bdb36192f35..6ba2b1a4412d 100644
--- a/clang-tools-extra/clang-query/tool/ClangQuery.cpp
+++ b/clang-tools-extra/clang-query/tool/ClangQuery.cpp
@@ -37,6 +37,7 @@
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/WithColor.h"
+#include <optional>
 #include <string>
 
 using namespace clang;