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

Summary:
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:

```c++
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

llvm-svn: 234254

1 files changed, 5 insertions, 10 deletions

diff --git a/libcxxabi/test/catch_member_data_pointer_01.pass.cpp b/libcxxabi/test/catch_member_data_pointer_01.pass.cpp
index 298a1c02561..28bf4b569b9 100644
--- a/libcxxabi/test/catch_member_data_pointer_01.pass.cpp
+++ b/libcxxabi/test/catch_member_data_pointer_01.pass.cpp
@@ -72,7 +72,7 @@ void test2()
     }
 }
 
-// Check that Base -> Derived conversions are allowed.
+// Check that Base -> Derived conversions are NOT allowed.
 void test3()
 {
     try
@@ -90,14 +90,14 @@ void test3()
     }
     catch (der1)
     {
+        assert(false);
     }
     catch (md1)
     {
-        assert(false);
     }
 }
 
-// Check that Base -> Derived conversions are allowed with different cv
+// Check that Base -> Derived conversions NOT are allowed with different cv
 // qualifiers.
 void test4()
 {
@@ -108,18 +108,13 @@ void test4()
     }
     catch (der2)
     {
-    }
-    catch (...)
-    {
         assert(false);
     }
-
-    try
+    catch (der1)
     {
-        throw &A::j;
         assert(false);
     }
-    catch (der1)
+    catch (md2)
     {
     }
     catch (...)