[llvm] [MergeICmps][DebugInfo] Preserve debug locations in mergeComparisons (PR #205796)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

Fixed up the header (removed extra newline, replaced the "target triple" header with a cmdline arg) - as mentioned on the other review, update_test_checks adds the dots (at a glance it looks like it adds them at: `llvm/utils/UpdateTestChecks/common.py:2676`)

https://github.com/llvm/llvm-project/pull/205796