[clang] [Clang] Allow __is_nothrow_convertible to be used as an identifier (PR #80476)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 9cc2122bf5a81f7063c2a32b2cb78c8d615578a1 fb4160b50535fd16951c5261e6c7d91da0cd92b0 -- clang/test/SemaCXX/libstdcxx_is_nothrow_convertible_hack.cpp clang/lib/Parse/ParseDeclCXX.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 79928ddb5a..35b4607bf8 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -1694,64 +1694,32 @@ void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
       Tok.isOneOf(
 #define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) tok::kw___##Trait,
 #include "clang/Basic/TransformTypeTraits.def"
-          tok::kw___is_abstract,
-          tok::kw___is_aggregate,
-          tok::kw___is_arithmetic,
-          tok::kw___is_array,
-          tok::kw___is_assignable,
-          tok::kw___is_base_of,
-          tok::kw___is_bounded_array,
-          tok::kw___is_class,
-          tok::kw___is_complete_type,
-          tok::kw___is_compound,
-          tok::kw___is_const,
-          tok::kw___is_constructible,
-          tok::kw___is_convertible,
-          tok::kw___is_convertible_to,
-          tok::kw___is_destructible,
-          tok::kw___is_empty,
-          tok::kw___is_enum,
-          tok::kw___is_floating_point,
-          tok::kw___is_final,
-          tok::kw___is_function,
-          tok::kw___is_fundamental,
-          tok::kw___is_integral,
-          tok::kw___is_interface_class,
-          tok::kw___is_literal,
-          tok::kw___is_lvalue_expr,
-          tok::kw___is_lvalue_reference,
-          tok::kw___is_member_function_pointer,
-          tok::kw___is_member_object_pointer,
-          tok::kw___is_member_pointer,
-          tok::kw___is_nothrow_assignable,
-          tok::kw___is_nothrow_constructible,
-          tok::kw___is_nothrow_convertible,
-          tok::kw___is_nothrow_destructible,
-          tok::kw___is_nullptr,
-          tok::kw___is_object,
-          tok::kw___is_pod,
-          tok::kw___is_pointer,
-          tok::kw___is_polymorphic,
-          tok::kw___is_reference,
-          tok::kw___is_referenceable,
-          tok::kw___is_rvalue_expr,
-          tok::kw___is_rvalue_reference,
-          tok::kw___is_same,
-          tok::kw___is_scalar,
-          tok::kw___is_scoped_enum,
-          tok::kw___is_sealed,
-          tok::kw___is_signed,
-          tok::kw___is_standard_layout,
-          tok::kw___is_trivial,
+          tok::kw___is_abstract, tok::kw___is_aggregate,
+          tok::kw___is_arithmetic, tok::kw___is_array, tok::kw___is_assignable,
+          tok::kw___is_base_of, tok::kw___is_bounded_array, tok::kw___is_class,
+          tok::kw___is_complete_type, tok::kw___is_compound, tok::kw___is_const,
+          tok::kw___is_constructible, tok::kw___is_convertible,
+          tok::kw___is_convertible_to, tok::kw___is_destructible,
+          tok::kw___is_empty, tok::kw___is_enum, tok::kw___is_floating_point,
+          tok::kw___is_final, tok::kw___is_function, tok::kw___is_fundamental,
+          tok::kw___is_integral, tok::kw___is_interface_class,
+          tok::kw___is_literal, tok::kw___is_lvalue_expr,
+          tok::kw___is_lvalue_reference, tok::kw___is_member_function_pointer,
+          tok::kw___is_member_object_pointer, tok::kw___is_member_pointer,
+          tok::kw___is_nothrow_assignable, tok::kw___is_nothrow_constructible,
+          tok::kw___is_nothrow_convertible, tok::kw___is_nothrow_destructible,
+          tok::kw___is_nullptr, tok::kw___is_object, tok::kw___is_pod,
+          tok::kw___is_pointer, tok::kw___is_polymorphic,
+          tok::kw___is_reference, tok::kw___is_referenceable,
+          tok::kw___is_rvalue_expr, tok::kw___is_rvalue_reference,
+          tok::kw___is_same, tok::kw___is_scalar, tok::kw___is_scoped_enum,
+          tok::kw___is_sealed, tok::kw___is_signed,
+          tok::kw___is_standard_layout, tok::kw___is_trivial,
           tok::kw___is_trivially_equality_comparable,
           tok::kw___is_trivially_assignable,
-          tok::kw___is_trivially_constructible,
-          tok::kw___is_trivially_copyable,
-          tok::kw___is_unbounded_array,
-          tok::kw___is_union,
-          tok::kw___is_unsigned,
-          tok::kw___is_void,
-          tok::kw___is_volatile,
+          tok::kw___is_trivially_constructible, tok::kw___is_trivially_copyable,
+          tok::kw___is_unbounded_array, tok::kw___is_union,
+          tok::kw___is_unsigned, tok::kw___is_void, tok::kw___is_volatile,
           tok::kw___reference_binds_to_temporary,
           tok::kw___reference_constructs_from_temporary))
     // GNU libstdc++ 4.2 and libc++ use certain intrinsic names as the

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https://github.com/llvm/llvm-project/pull/80476