Change the disassemble option to specify the architecture from '-a'
to '-A'.

Add option '-a' / '--address' to disassemble which will find the
function that contains that address, and disassemble the entire function.

<rdar://problem/13436207> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@179258 91177308-0d34-0410-b5e6-96231b3b80d8