Add an option to specify the symbols to disassemble instead of the existing...

Add an option to specify the symbols to disassemble instead of the existing 'num of symbols to disassemble'
option.  If both are present, the 'symbols to disassemble' overrides the 'num of symbols to disassemble'.

An example usage:

$ ./lldb-disasm.py -C 'platform create remote-ios' -e /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/libSystem.B.dylib -o '-r -n' -s vprintf -s acosf_special

llvm-svn: 128569