[PATCH] Fix PR17239 by changing the semantics of the RemainingArgsClass Option kind (clang side)

[Rafael Auler]

This is the clang side of my updated patch in D4899. I updated the Driver to cope with the new LLVM API proposed in that patch: 

- Call ExpandResponseFiles with MarkEOLs set to true to allow correct expansion of the /LINK argument, fixing PR17239. Only do this for the clang driver, not for clang -cc1 tools.
- Ignore nullptrs in the argv vector because they are now used to indicate end of lines.

I also updated the Driver::ParseArgStrings parameter name that had a confusing argument name that was the same of a known class used in the same scope (NFC).

http://reviews.llvm.org/D4900

Files:
  lib/Driver/Driver.cpp
  test/Driver/cl-link-at-file.c
  tools/driver/driver.cpp
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