Merge branch 'jc/rename-degrade-cc-to-c' into maint

* jc/rename-degrade-cc-to-c:
diffcore-rename: fall back to -C when -C -C busts the rename limit
diffcore-rename: record filepair for rename src
diffcore-rename: refactor "too many candidates" logic
builtin/diff.c: remove duplicated call to diff_result_code()

diff --cc builtin/diff.c
Simple merge

diff --cc builtin/log.c
Simple merge

diff --cc diff.c
Simple merge

diff --cc diff.h
Simple merge

diff --cc diffcore-rename.c
Simple merge

diff --cc merge-recursive.c
Simple merge

diff --cc t/t4001-diff-rename.sh
Simple merge