[clang-tools-extra] Use std::optional instead of llvm::Optional (NFC)

This patch replaces (llvm::|)Optional< with std::optional<.  I'll post
a separate patch to clean up the "using" declarations, #include
"llvm/ADT/Optional.h", etc.

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, 3 deletions

diff --git a/clang-tools-extra/clang-query/Query.cpp b/clang-tools-extra/clang-query/Query.cpp
index d1db851..c436d6f 100644
--- a/clang-tools-extra/clang-query/Query.cpp
+++ b/clang-tools-extra/clang-query/Query.cpp
@@ -184,7 +184,7 @@ bool MatchQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
     std::vector<BoundNodes> Matches;
     DynTypedMatcher MaybeBoundMatcher = Matcher;
     if (QS.BindRoot) {
-      llvm::Optional<DynTypedMatcher> M = Matcher.tryBind("root");
+      std::optional<DynTypedMatcher> M = Matcher.tryBind("root");
       if (M)
         MaybeBoundMatcher = *M;
     }
diff --git a/clang-tools-extra/clang-query/QueryParser.cpp b/clang-tools-extra/clang-query/QueryParser.cpp
index 77621d2..4193362 100644
--- a/clang-tools-extra/clang-query/QueryParser.cpp
+++ b/clang-tools-extra/clang-query/QueryParser.cpp
@@ -276,7 +276,7 @@ QueryRef QueryParser::doParse() {
     Diagnostics Diag;
     auto MatcherSource = Line.ltrim();
     auto OrigMatcherSource = MatcherSource;
-    Optional<DynTypedMatcher> Matcher = Parser::parseMatcherExpression(
+    std::optional<DynTypedMatcher> Matcher = Parser::parseMatcherExpression(
         MatcherSource, nullptr, &QS.NamedValues, &Diag);
     if (!Matcher) {
       return makeInvalidQueryFromDiagnostics(Diag);
diff --git a/clang-tools-extra/clang-query/tool/ClangQuery.cpp b/clang-tools-extra/clang-query/tool/ClangQuery.cpp
index 6ba2b1a..da7ac27 100644
--- a/clang-tools-extra/clang-query/tool/ClangQuery.cpp
+++ b/clang-tools-extra/clang-query/tool/ClangQuery.cpp
@@ -169,7 +169,7 @@ int main(int argc, const char **argv) {
     LE.setListCompleter([&QS](StringRef Line, size_t Pos) {
       return QueryParser::complete(Line, Pos, QS);
     });
-    while (llvm::Optional<std::string> Line = LE.readLine()) {
+    while (std::optional<std::string> Line = LE.readLine()) {
       QueryRef Q = QueryParser::parse(*Line, QS);
       Q->run(llvm::outs(), QS);
       llvm::outs().flush();