[clang] Fix help string output for cl's `/experimental:deterministic` option. NFC (PR #207083)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Vladimir Vereschaka (vvereschaka)

<details>
<summary>Changes</summary>

The `clang-cl -help` command show the help string for `/experimental:deterministic` options with the default metavar name value that should not be:

  /experimental:deterministic<value>

This patch fixes this output and omits the `<value>` part for the option.

---
Full diff: https://github.com/llvm/llvm-project/pull/207083.diff


1 Files Affected:

- (modified) clang/include/clang/Options/Options.td (+1-1) 


``````````diff
diff --git a/clang/include/clang/Options/Options.td b/clang/include/clang/Options/Options.td
index 3a3952a4397be..7a0ca182be0a4 100644
--- a/clang/include/clang/Options/Options.td
+++ b/clang/include/clang/Options/Options.td
@@ -9400,7 +9400,7 @@ def : CLFlag<"Qgather-">, Alias<mno_gather>,
       HelpText<"Disable generation of gather instructions in auto-vectorization(x86 only)">;
 def : CLFlag<"Qscatter-">, Alias<mno_scatter>,
       HelpText<"Disable generation of scatter instructions in auto-vectorization(x86 only)">;
-def _SLASH_experimental_deterministic : CLJoined<"experimental:deterministic">,
+def _SLASH_experimental_deterministic : CLFlag<"experimental:deterministic">,
       HelpText<"Emit warnings on usage of non-deterministic macros __DATE__, __TIME__ and __TIMESTAMP__">;
 def _SLASH_d1nodatetime : CLFlag<"d1nodatetime">,
       HelpText<"Undefine the standard preprocessor macros __DATE__, __TIME__ and __TIMESTAMP__">;

``````````

</details>


https://github.com/llvm/llvm-project/pull/207083