Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

hip-default-gpu-arch.hip
// REQUIRES: x86-registered-target
// REQUIRES: amdgpu-registered-target

// RUN: %clang -### -c %s 2>&1 | FileCheck %s

// CHECK: {{.*}}clang{{.*}}"-target-cpu" "gfx803"