[llvm-branch-commits] [libcxx] [libc++] Adds is_implemented function for new ftm generator. (PR #134538)

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``````````bash
darker --check --diff -r HEAD~1...HEAD libcxx/test/libcxx/feature_test_macro/is_implemented.sh.py libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py libcxx/utils/generate_feature_test_macro_components.py
``````````

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View the diff from darker here.
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``````````diff
--- utils/generate_feature_test_macro_components.py	2025-04-06 13:10:49.000000 +0000
+++ utils/generate_feature_test_macro_components.py	2025-04-06 13:37:58.083082 +0000
@@ -2215,15 +2215,17 @@
         # When a paper for C++20 has not been implemented in libc++, then there will be no
         # FTM entry in implemented_ftms for C++23 and later.
         #
         # Typically standard_ftms is not used with invalid values in the code, but
         # guard just in case.
-        if not std in self.implemented_ftms[ftm].keys() or not std in self.standard_ftms[ftm].keys():
+        if (
+            not std in self.implemented_ftms[ftm].keys()
+            or not std in self.standard_ftms[ftm].keys()
+        ):
             return False
 
         return self.implemented_ftms[ftm][std] == self.standard_ftms[ftm][std]
-
 
     @functools.cached_property
     def ftm_metadata(self) -> Dict[Ftm, Metadata]:
         """Returns the metadata of the FTMs defined in the Standard.
 

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https://github.com/llvm/llvm-project/pull/134538