[PATCH v3 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 v2:
  * Add another step I forgot in my testcase setup -- setting
    merge.directoryRenames (noticed by Sangeeta); I've double checked
    that I didn't forget any other settings.

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:  8783f209ef ! 1:  644f458c01 merge-ort: begin performance work; instrument with trace2_region_* calls
    @@ Commit message
           $ git mv drivers pilots  # Introduce over 26,000 renames
           $ git commit -m "Rename drivers/ to pilots/"
           $ git config merge.renameLimit 30000
    +      $ git config merge.directoryRenames true
     
         === Testcases ===