Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

BUILD.gn
static_library("MSF") {
  output_name = "LLVMDebugInfoMSF"
  deps = [ "//llvm/lib/Support" ]
  sources = [
    "MSFBuilder.cpp",
    "MSFCommon.cpp",
    "MSFError.cpp",
    "MappedBlockStream.cpp",
  ]
}