Set -Cpanic=abort in windows-msvc stack protector tests
I ran into a test failure with the 32-bit windows test on https://github.com/rust-lang/rust/pull/117192, one of the tests has been incorrectly passing (until my change!) because it is picking up the stack protector from another function. I've tried to prevent that happening again by adding CHECK-DAGs for the start and end of each function.
I've also done my best to correct the comments, some were based on the fact that we used to run these tests with unwinding panics, but LLVM doesn't add protectors to function with SEH funclets so it's must more straightforward for these tests to use `-Cpanic=abort`.
Test the coexistence of 'stack-protector' and 'safe-stack'
This is a test to detect the coexistence of 'stack-protector' and 'safe-stack', and it's a supplement to pr rust-lang/rust#147115 . After the solution to issue rust-lang/rust#149340, I rewrote a version using minicore to circumvent the 'abi_mismatch' error.
r? `@SparrowLii` (Do you have time to review it?)
Jonathan Brouwer