[clang-tools-extra] [clangd][modules] Remove the options when driver detects that it was unsupported, and log them (PR #200001)

[via cfe-commits]

================
@@ -273,6 +273,21 @@ void CommandMangler::operator()(tooling::CompileCommand 
&Command,
       SawInput(Cmd[I]);
     Cmd.resize(DashDashIndex);
   }
+
+  llvm::SmallVector<const char *, 16> UnsupportedArgs;
+
+  for (auto *UnknownArg : ArgList.filtered(options::OPT_UNKNOWN)) {
+    unsigned Index = UnknownArg->getIndex();
+    const auto *Argument = UnknownArg->getValue();
----------------
Decodetalkers wrote:

I have already tested, it seems give me the right value, not just bar, I think 
it is safe

https://github.com/llvm/llvm-project/pull/200001
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