[llvm] [RemoveDIs] Fix spliceDebugInfo splice-to-end edge case (PR #105671)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

Assuming that the crash less desirable than a leak I'll suppress a leak in the test and reopen the issue to avoid revert.

https://github.com/llvm/llvm-project/pull/105671