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

[Aleksandr Platonov via cfe-commits]

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@@ -327,6 +339,10 @@ void CommandMangler::operator()(tooling::CompileCommand &Command,
     return Elem.starts_with("--save-temps") || Elem.starts_with("-save-temps");
   });
 
+  if (UnsupportedArguments.length() != 0) {
+    log("Warning: detected unsupported Flags {0}", UnsupportedArguments);
+  }
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ArcsinX wrote:

Why don't we print this warning immediately after collecting these unsupported flags?

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