[llvm] [llvm-support][llvm-profdata] Use cl::Subcommand to organize show options. And look up in top-level as a fallback if a special subcommand doesn't have an option. (PR #71328)

[Mingming Liu via llvm-commits]

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@@ -1667,6 +1667,13 @@ bool CommandLineParser::ParseCommandLineOptions(int argc,
       Handler = LookupLongOption(*ChosenSubCommand, ArgName, Value,
                                  LongOptionsUseDoubleDash, HaveDoubleDash);
 
+      // If Handler is not found in a specialized subcommand, look up handler
+      // in the top-level subcommand.
+      // cl::opt without cl::sub belongs to top-level subcommand.
+      if (!Handler && ChosenSubCommand != &SubCommand::getTopLevel())
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minglotus-6 wrote:

> Lets split the changes llvm/Support/CommandLine out into a separate patch and add a test to cover this case. We can reference this PR as the motivation.

Sent out pr/71776 as a separate patch.

https://github.com/llvm/llvm-project/pull/71328