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Instantiating C++ function templates with Swift types is not currently supported, but the Swift compiler attempts to do so. Sometimes this leads to a compiler crash; other times it leads to a runtime crash. This patch turns those crashes into compiler errors. At the call site of a C++ function template, the Swift compiler must convert Swift types deduced by the Swift type checker back into Clang types, which are then used to instantiate the C++ function template. Prior to this patch, this conversion was performed by ClangTypeConverter::convert(), which converts unsupported Swift types. This patch factors out some reusable parts of convert() and uses them in a new ClangTypeConverter::convertTemplateArgument() method that only converts supported template argument types. In the future, this method can be elaborated to support instantiating C++ templates with more types. rdar://112692940