[NFC] Update code owners file

- Replace Pete with Mark as owner of ARC backend
- Re-order Philip to be sorted by first name

GitOrigin-RevId: a4ac34bfb0a72b156266c335611d0a9de63c679a
diff --git a/CODE_OWNERS.TXT b/CODE_OWNERS.TXT
index 5d7f45c..1b62968 100644
--- a/CODE_OWNERS.TXT
+++ b/CODE_OWNERS.TXT
@@ -58,14 +58,6 @@
 E: clayborg@gmail.com
 D: LLDB
 
-N: Pete Couperus
-E: petecoup@synopsys.com
-D: ARC backend (lib/Target/ARC/*)
-
-N: Philip Reames
-E: listmail@philipreames.com
-D: IndVar Simplify, Scalar Evolution
-
 N: Marshall Clow
 E: mclow.lists@gmail.com
 D: libc++
@@ -189,6 +181,10 @@
 E: jpienaar@google.com
 D: Lanai Backend
 
+N: Philip Reames
+E: listmail@philipreames.com
+D: IndVar Simplify, Scalar Evolution
+
 N: Paul Robinson
 E: paul_robinson@playstation.sony.com
 D: Sony PlayStation®4 support
@@ -201,6 +197,10 @@
 E: baldrick@free.fr
 D: DragonEgg
 
+N: Mark Schimmel
+E: marksl@synopsys.com
+D: ARC backend (lib/Target/ARC/*)
+
 N: Kostya Serebryany
 E: kcc@google.com
 D: AddressSanitizer, ThreadSanitizer (LLVM parts)