Make myself the code owner for llgo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223691 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding xtype halfword add/sub ll/hl/lh/hh/sat/<<16 instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223692 91177308-0d34-0410-b5e6-96231b3b80d8