Revert commit r186217 -- this is breaking bots:

http://lab.llvm.org:8013/builders/clang-x86_64-darwin11-nobootstrap-RAincremental/builds/4328

Original commit log:
  Use the function attributes to pass along the stack protector buffer
  size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186234 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/CommandFlags.h

@@ -220,4 +220,8 @@ cl::opt<std::string> StartAfter("start-after",
                           cl::value_desc("pass-name"),
                           cl::init(""));
 
+cl::opt<unsigned>
+SSPBufferSize("stack-protector-buffer-size", cl::init(8),
+              cl::desc("Lower bound for a buffer to be considered for "
+                       "stack protection"));
 #endif