[clang] [driver] Respect the mode the driver is in for autocomplete (PR #74770)

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git-clang-format --diff 58c2a4e806b2882c0622cbded923b32f94c5b47b 255c261df90bd15d3bcee7a212758c2de4c56e69 -- clang/lib/Driver/Driver.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 49e272f69d..0b8e957297 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1991,7 +1991,7 @@ void Driver::HandleAutocompletions(StringRef PassedFlags) const {
   std::vector<std::string> SuggestedCompletions;
   std::vector<std::string> Flags;
 
-  llvm::opt::Visibility VisibilityMask =  getOptionVisibilityMask();
+  llvm::opt::Visibility VisibilityMask = getOptionVisibilityMask();
 
   // Distinguish "--autocomplete=-someflag" and "--autocomplete=-someflag,"
   // because the latter indicates that the user put space before pushing tab

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https://github.com/llvm/llvm-project/pull/74770