[llvm] [MCJIT][test] Move remaining MCJIT interpreter tests to Interpreter/ subdirectory (PR #124744)

[Alex Bradbury via llvm-commits]

asb wrote:

> ⚠️ undef deprecator found issues in your code. ⚠️

This PR simply moves existing tests, so I think this can reasonably be ignored (even if in separate work, people might evaluate if undef is desirable or not in these cases).

https://github.com/llvm/llvm-project/pull/124744