Add debug flag to turn off landing pads.

Change `print_diff` to output the correct line number.

bump ui test crate

The recommended way to run tests locally is `./miri bless -- -- --quiet`, which will show

* progress bars
* the currently running tests (allowing you to see which ones are still running towards the end of the test suite)
* the output of the currently running tests (if they are slow). This means slow running tests can output lines to `stderr` and the last line will be shown after the test name and updated every few hundred milliseconds.

As a side effect this PR also fixes rust-lang#2998 and only builds dependencies if any tests actually need them (this means that with the next ui_test update we'll be able to merge all our test suites).

Also fixes rust-lang/miri#3052.

This is still incomplete, but hopefully it can be merged as an unstable
feature. I'll publish an RFC shortly.

This instruments the function body with assertion checks to see if users
are generating invalid values. This covers:
  - Union access
  - Raw pointer dereference
  - Transmute value
  - Field assignment of struct with invalid values
  - Aggregate assignment

Things not covered today should trigger ICE or a delayed verification
failure due to unsupported feature.

## Design

This change has two main design changes which are inside the new
`kani_compiler::kani_middle::transform` module:
1- Instance body should now be retrieved from the `BodyTransformation`
structure. This structure will run transformation passes on instance
bodies (i.e.: monomorphic instances) and cache the result.
2- Create a new transformation pass that instruments the body of a
function for every potential invalid value generation.
3- Create a body builder which contains all elements of a function body
and mutable functions to modify them accordingly.


Related to rust-lang#2998
Fixes rust-lang#301 

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Co-authored-by: Zyad Hassan <88045115+zhassan-aws@users.noreply.github.com>