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Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

lineno-dbginfo.c
// RUN: echo "#include <stddef.h>" > %t.h
// RUN: %clang_cc1 -S -debug-info-kind=limited -include %t.h %s -emit-llvm -o - | FileCheck %s

// CHECK: !DIGlobalVariable(name: "outer",
// CHECK-NOT:               linkageName:
// CHECK-SAME:              line: [[@LINE+2]]
// CHECK-SAME:              isDefinition: true
int outer = 42;