Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

symbol-table.test
RUN: llvm-objdump -t %p/Inputs/trivial.obj.wasm | FileCheck %s

CHECK:      SYMBOL TABLE:
CHECK-NEXT: 00000001 g     F CODE	main
CHECK-NEXT: 00000000 l     O DATA	.L.str
CHECK-NEXT: 00000000       F *UND*	puts
CHECK-NEXT: 00000019 l     F CODE	.LSomeOtherFunction_bitcast
CHECK-NEXT: 00000000       F *UND*	SomeOtherFunction
CHECK-NEXT: 00000010 g     O DATA	var