NFC: Expand -target-min-inlining-versiong tests to cover a number of corner cases:

- unavailable declarations and unavailable containers
- SPI declarations and spi containers
- property initializer expressions
- property wrappers

The tests document existing behavior of the availability checker, including several bugs. The FIXMEs in the test serve as a todo list of issues to resolve before the flag can be adopted widely.

Author: tshortli