[clang-tools-extra] [clang-tidy] modernize-make-shared: Add MakeSmartPtrType option (PR #117529)

[via cfe-commits]

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+.. title:: clang-tidy - misc-make-smart-ptr
+
+misc-make-smart-ptr
+====================
+
+Finds constructions of custom smart pointer types from raw ``new`` expressions
+and replaces them with a configurable factory function.
+
+Unlike :doc:`modernize-make-shared <../modernize/make-shared>` and
+:doc:`modernize-make-unique <../modernize/make-unique>`, this check has no
+default smart pointer type or factory function. Both ``MakeSmartPtrType`` and
+``MakeSmartPtrFunction`` must be configured for the check to produce
+diagnostics.
+
+This allows using the ``modernize-make-shared`` and ``modernize-make-unique``
+checks with their default ``std::shared_ptr``/``std::unique_ptr`` types, while
+also matching additional custom smart pointer types through this check.
+
+.. code-block:: c++
+
+  // Given MakeSmartPtrType = '::base::scoped_refptr'
+  //       MakeSmartPtrFunction = 'base::MakeRefCounted'
+  base::scoped_refptr<Foo> ptr(new Foo(1, 2));
+
+  // becomes
+
+  auto ptr = base::MakeRefCounted<Foo>(1, 2);
+
+Options
+-------
+
+.. option:: MakeSmartPtrFunction
+
+   A string specifying the name of the factory function. This option must be
+   set for the check to work. Default is empty.
----------------
EugeneZelenko wrote:

```suggestion
   set for the check to work. Default is empty string.
```

https://github.com/llvm/llvm-project/pull/117529