[PATCH] [libcxxabi] Correctly export _Unwind_[GS]et(GR|IP) for EHABI.

[Jonathan Roelofs]

This is what I had in mind when we discussed this on irc this morning. Might want to add a link to http://mentorembedded.github.io/cxx-abi/abi-eh.html in the commit message, explaining why you're justified in doing this.

It looks OK to me, but I'll defer to @kledzik on the final go-ahead.

http://reviews.llvm.org/D5754