Add CoreCLR implementation of CallConvMemberFunction. (#47828)

Add CoreCLR implementation of CallConvMemberFunction. (#47828)

* Add CoreCLR implementation of CallConvMemberFunction.

* Add tests and make a few fixes to get them passing.

* Fix Clang build

* Fix argument ordering for calling a cdecl or stdcall instance method from managed.

* Update src/coreclr/dlls/mscorrc/mscorrc.rc

Co-authored-by: Jan Kotas <jkotas@microsoft.com>
* Fix UnmanagedCallersOnly instance method calls for stdcall and cdecl.

* Update issues.targets.

* Fix formatting.

* Add dummy param to validate param order. Rewrite traversal to second-to-last argument.

* Merge implementations of call conv modopt name comparison.

Use a macro-based implementation initially since it allows us to add new calling conventions by adding one line and the macro-ized code is relatively small.

* Fix assignment alignment.

* SAL and contracts.

* Add assert

* Fix UnmanagedCallersOnly parsing in the refactored parser.

Co-authored-by: Jan Kotas <jkotas@microsoft.com>