[llvm] [Asan] Pre-commit test for asan support of funclet token (PR #82631)

[via llvm-commits]

sylvain-audi wrote:

Note that this test now also applies `win-eh-prepare` pass, on top of `asan` one.
It was to highlight the outcome of the bug, since WinEHPrepare would invalidate entire BBs due to missing funclet tokens.
Without that extra pass, the diff would only show the added tokens, not highlighting the bug fix for https://github.com/llvm/llvm-project/issues/64990.

Please let me know if you think I should go back to not involving `win-eh-prepare`.

https://github.com/llvm/llvm-project/pull/82631