[libcxxabi] Disallow Base to Derived conversions for catching pointers to members.

I accidentally implemented the 4.11 [conv.mem] conversions for libc++abi in a recent patch. @majnemer pointed out that 5.13 [except.handle] only allows the pointer conversions in 4.10 and not those is 4.11. This patch no longer allows the following example code:

struct A {};
struct B : public A {};

int main() {
  try {
    throw (int A::*)0;
  } catch (int B::*) {
    // exception caught here.

Reviewers: mclow.lists, jroelofs, majnemer

Reviewed By: majnemer

Subscribers: majnemer, cfe-commits

Differential Revision: http://reviews.llvm.org/D8845

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@234254 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed