Add cmdline options for LC_DATA_IN_CODE load command.

Add cmdline options for LC_DATA_IN_CODE load command.

Also added the defaults for whether to generate this load command, which
the cmdline options are able to override.

There was also a difference to ld64 which is fixed here in that ld64 will
generate an empty data in code command if requested.

rdar://problem/24472630

llvm-svn: 260191