swift234

Reflection: Clean up duplication in typeref_decoding*.result.txt

Previously we would pre-process the same input files in the ObjC
and non-ObjC tests. This made the tests difficult to update because
the output of one was a subset of the other, and only one of the
two tests would run on any given platform.

Instead, let's just put the Objective-C tests in their own test
and input files.