[clang] [clang][deps] Skip slow `UNHASHED_CONTROL_BLOCK` records (PR #69975)

[Ben Langmuir via cfe-commits]

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@@ -2944,6 +2944,10 @@ def fno_modules_validate_textual_header_includes :
   MarshallingInfoNegativeFlag<LangOpts<"ModulesValidateTextualHeaderIncludes">>,
   HelpText<"Do not enforce -fmodules-decluse and private header restrictions for textual headers. "
            "This flag will be removed in a future Clang release.">;
+defm modules_skip_diagnostic_options : BoolFOption<"modules-skip-diagnostic-options",
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benlangmuir wrote:

Seems worth having a test, and a (frontend) option seems like the easiest way to do that.

https://github.com/llvm/llvm-project/pull/69975