[PATCH] [ELF] Support response file.

[Reid Kleckner]

================
Comment at: lib/Driver/GnuLdDriver.cpp:104
@@ +103,3 @@
+static std::tuple<int, const char **>
+maybeExpandResponseFiles(int argc, const char **argv, BumpPtrAllocator &alloc) {
+  bool expanded = false;
----------------
Any reason why cl::ExpandResponseFiles() can't be used instead of this reimplementation?


http://llvm-reviews.chandlerc.com/D3210