1. Change some "\n" -> '\n'.
2. eliminte some std::string's by using raw_ostream::indent.
3. move a bunch of code out of the main arg parser routine into
a new static HandlePrefixedOrGroupedOption function.
4. Greatly simplify the implementation of getOptionPred, and make
it avoid splitting prefix options at = when that doesn't match
a non-prefix option.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82362 91177308-0d34-0410-b5e6-96231b3b80d8