CODE_OWNERS: Take ownership of the MIPS backend

As agreed with Simon Dardis, I'm taking over as a code owner
for the MIPS backend.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335213 91177308-0d34-0410-b5e6-96231b3b80d8

CODE_OWNERS.TXT

@@ -9,6 +9,10 @@ beautification by scripts. The fields are: name (N), email (E), web-address
 (S) and (I) IRC handle. Each entry should contain at least the (N), (E) and
 (D) fields.
 
+N: Simon Atanasyan
+E: simon@atanasyan.com
+D: MIPS Backend (lib/Target/Mips/*)
+
 N: Justin Bogner
 E: mail@justinbogner.com
 D: InstrProfiling and related parts of ProfileData
@@ -64,10 +68,6 @@ N: Quentin Colombet
 E: quentin.colombet@gmail.com
 D: Loop Strength Reduction, Register allocators
 
-N: Simon Dardis
-E: simon.dardis@mips.com
-D: MIPS Backend (lib/Target/Mips/*)
-
 N: Andrea Di Biagio
 E: andrea.dibiagio@sony.com
 E: andrea.dibiagio@gmail.com