Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
add_llvm_component_library(LLVMBitstreamReader BitstreamReader.cpp ADDITIONAL_HEADER_DIRS ${LLVM_MAIN_INCLUDE_DIR}/llvm/Bitcode ${LLVM_MAIN_INCLUDE_DIR}/llvm/Bitstream LINK_COMPONENTS Support )