[PATCH] GCC compatibility: pass -z linker options to the linker

[Arthur]

Add a warning whenever someone passes -z alone.

http://reviews.llvm.org/D4393

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  include/clang/Driver/Options.td
  lib/Driver/Tools.cpp
  test/Driver/Xlinker-args.c
  test/Driver/clang_f_opts.c
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