Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

cfi-inserter-cfg-with-merge.mir
# RUN: llc -o - %s -mtriple=x86_64-- -verify-cfiinstrs -run-pass=cfi-instr-inserter

--- |
  define void @foo() { ret void }
...
---
name: foo
body: |
  bb.0:
    JCC_1 %bb.3, 4, implicit $eflags
  bb.1:
    CFI_INSTRUCTION def_cfa_offset 24
  bb.2:
    CFI_INSTRUCTION def_cfa_offset 8
  bb.3:
    RET 0
...