OptionValueFileSpec shouldn't be doing argument
parsing on the file name it gets.  That confuses
it if there are spaces in the file name.

<rdar://problem/13380392>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176719 91177308-0d34-0410-b5e6-96231b3b80d8