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

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

There is a memory leak,
not sure if in test on patched code https://lab.llvm.org/buildbot/#/builders/169/builds/2622/steps/9/logs/stdio

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