[PATCH v2 0/1] And so it begins...merge/rename performance work

This depends on a merge of en/ort-conflict-handling, en/diffcore-rename, and en/ort-directory-rename.

Changes since v1:
  * Add a step I forgot in my testcase setup -- increasing
    merge.renameLimit
  * Add Acked-by from Taylor

Elijah Newren (1):
  merge-ort: begin performance work; instrument with trace2_region_*
    calls

 diffcore-rename.c |  8 +++++++
 merge-ort.c       | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)

Range-diff:
1:  9542932eee ! 1:  8783f209ef merge-ort: begin performance work; instrument with trace2_region_* calls
    @@ Commit message
           $ git switch -c 5.4-renames v5.4
           $ git mv drivers pilots  # Introduce over 26,000 renames
           $ git commit -m "Rename drivers/ to pilots/"
    +      $ git config merge.renameLimit 30000
     
         === Testcases ===
     
    @@ Commit message
           is noticeably faster with merge-ort than with apply-based rebase.
     
         Signed-off-by: Elijah Newren <newren@gmail.com>
    +    Acked-by: Taylor Blau <ttaylorr@github.com>
     
      ## diffcore-rename.c ##
     @@ diffcore-rename.c: void diffcore_rename(struct diff_options *options)