Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

PR4611-bitfield-layout.c
// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - | FileCheck %s
//
// CHECK: struct.object_entry = type { i32 }

struct object_entry {
       unsigned int type:3, pack_id:16, depth:13;
} entries;