llvm-objdump started warning when asked to disassemble a section that
isn't present in the input files, in Yuanfang Chen's change:
d16c162c9453db855503134fe29ae4a3c0bec936. The problem is that the
logic was restricted only to the generic llvm-objdump parser, not to the
Mach-O-specific parser used for Apple toolchain compatibility. The
solution is to log section names from the Mach-O parser.
The macho-cstring-dump.test has been updated to fail if it encounters
this new warning in the future.