Quash a TODO related to catching pointer-to-member. These tests fail on my...

Quash a TODO related to catching pointer-to-member.  These tests fail on my copy of gcc-4.2.  But I believe the tests to be correct (and they pass for libc++abi).  I've enquired on the C++ standards mailing list for a clarification in case I'm wrong.  So far I've gotten one response that agrees with me.

llvm-svn: 149534