[llvm] Add regalloc team to CODEOWNERS (PR #65208)

[Matt Arsenault via llvm-commits]

================
@@ -395,6 +395,36 @@ flang/**/CodeGen/ @llvm/pr-subscribers-flang-codegen
 /llvm/utils/TableGen/CodeGenDAG* @llvm/pr-subscribers-selectiondag
 /llvm/utils/TableGen/DAGISel* @llvm/pr-subscribers-selectiondag
 
+# register allocation
+/llvm/include/CodeGen/RegAlloc* @llvm/pr-subscribers-regalloc
----------------
arsenm wrote:

I'm pretty sure this is case sensitive, so no. I renamed the offending files so it shouldn't matter anymore

https://github.com/llvm/llvm-project/pull/65208