signal_in_leaf_function_aarch64 failing on darwin

[labath]

The test checks that we can unwind from within a signal handler in a leaf function, and the failure message seems to indicate the unwind failed. see #91321, which introduces the test.

[llvmbot]

@llvm/issue-subscribers-lldb

Author: Pavel Labath (labath)

The test checks that we can unwind from within a signal handler in a leaf function, and the failure message seems to indicate the unwind failed. see #91321, which introduces the test.