merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'
2020-01-11 23:36:56 +00:00 · 2020-01-11 23:36:56 +00:00 · 7ef0d62730
commit 7ef0d62730
parent 6a2a300707 1b593e1ea4
3629 changed files with 1139935 additions and 0 deletions
--- a/third_party/git/t/t4013/diff.show_--root_initial
+++ b/third_party/git/t/t4013/diff.show_--root_initial
@ -0,0 +1,34 @@
+$ git show --root initial
+commit 444ac553ac7612cc88969031b02b3767fb8a353a
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:00:00 2006 +0000
+
+    Initial
+
+diff --git a/dir/sub b/dir/sub
+new file mode 100644
+index 0000000..35d242b
+--- /dev/null
+++ b/dir/sub
+@@ -0,0 +1,2 @@
+A
+B
+diff --git a/file0 b/file0
+new file mode 100644
+index 0000000..01e79c3
+--- /dev/null
+++ b/file0
+@@ -0,0 +1,3 @@
+1
+2
+3
+diff --git a/file2 b/file2
+new file mode 100644
+index 0000000..01e79c3
+--- /dev/null
+++ b/file2
+@@ -0,0 +1,3 @@
+1
+2
+3
+$