[all-commits] [llvm/llvm-project] 815193: [ci] diff with main merge-base (#69308)

[Mikhail Goncharov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 815193f6be08e0f5876c9a0cb88c9df104710e68
      https://github.com/llvm/llvm-project/commit/815193f6be08e0f5876c9a0cb88c9df104710e68
  Author: Mikhail Goncharov <goncharov.mikhail at gmail.com>
  Date:   2023-10-17 (Tue, 17 Oct 2023)

  Changed paths:
    M .ci/generate-buildkite-pipeline-premerge

  Log Message:
  -----------
  [ci] diff with main merge-base (#69308)

Basically a reland of ec9d80ec43f5761a34c4a785c67d9e7d21ec8bda but now
with fetching of main before that to get a correct merge base.