Give A an explicitly non-throwing destructor so that B's destructor is

itself non-throwing.  Since nested_exception's destructor is
non-throwing, if B's destructor is not, this causes an error in C++03
mode due to the overriding function having a more lax specification.
This did not occur in C++0x mode as A's destructor was implicitly
non-throwing.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@135400 91177308-0d34-0410-b5e6-96231b3b80d8

test/language.support/support.exception/except.nested/rethrow_if_nested.pass.cpp

@@ -22,7 +22,7 @@ class A
     int data_;
 public:
     explicit A(int data) : data_(data) {}
-    virtual ~A() {}
+    virtual ~A() _NOEXCEPT {}
 
     friend bool operator==(const A& x, const A& y) {return x.data_ == y.data_;}
 };