Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

x86_64-hle-encoding.s
// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s

// CHECK: xacquire
// CHECK: [0xf2]
    xacquire

// CHECK: xrelease
// CHECK: [0xf3]
    xrelease