This allows to use different toolchain files for each and it reduces
build system repetition in test target setup.
The "tests-32" directories has been integrated into the "tests" one. Tests
that should only run on 32-bit are detected by their filename ending with
".32.cpp" now.
If a test is marked as a flake then it will be tried five times before
giving up.
Works around the problem of needing to babysit CI once a PR is pushed.
As long as we have all the flake tests marked.
The intent of these annotations was presumably to make it easier to adjust
build settings on a per-test basis, but doing this in the build system is
actually much cleaner.
This is a very basic test to check for overflow exception.
`into` instruction only exists on 32-bit, so it needs to not be built as
a 64-bit executable.