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_--first-parent_master
+++ b/third_party/git/t/t4013/diff.show_--first-parent_master
@ -0,0 +1,30 @@
+$ git show --first-parent master
+commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
+Merge: 9a6d494 c7a2ab9
+Author: A U Thor <author@example.com>
+Date:   Mon Jun 26 00:04:00 2006 +0000
+
+    Merge branch 'side'
+
+diff --git a/dir/sub b/dir/sub
+index cead32e..992913c 100644
+--- a/dir/sub
+++ b/dir/sub
+@@ -4,3 +4,5 @@ C
+ D
+ E
+ F
+1
+2
+diff --git a/file0 b/file0
+index b414108..10a8a9f 100644
+--- a/file0
+++ b/file0
+@@ -4,3 +4,6 @@
+ 4
+ 5
+ 6
+A
+B
+C
+$