[Bug 951] New: libgcc_s incorrect "header" information

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The data structure _UnwindException does not match the "C++ ABI".  Ours:

typedef unsigned int _Unwind_Ptr;
typedef unsigned int _Unwind_Word;
. . .
struct _Unwind_Exception
{
  _Unwind_Exception_Class;
  _Unwind_Exception_Cleanup_Fn;
  _Unwind_Word;
  _Unwind_Word;
}

This is an incomplete definition since we don't define types
_Unwind_Exception_Class or _Unwind_Exception_Cleanup_Fn. Also, the C++ ABI
requires the first, third and fourth members to be 64-bit, thus the "typedef
unsigned int" should be "typedef unsigned long". Here's the clip:

 Exception Header

The unwind interface uses a pointer to an exception header object as its
representation of an exception being thrown. In general, the full representation
of an exception object is language- and implementation-specific, but it will be
prefixed by a header understood by the unwind interface, defined as follows:

    typedef void (*_Unwind_Exception_Cleanup_Fn)
		(_Unwind_Reason_Code reason,
		 struct _Unwind_Exception *exc);

    struct _Unwind_Exception {
	    uint64			 exception_class;
	    _Unwind_Exception_Cleanup_Fn exception_cleanup;
	    uint64			 private_1;
	    uint64			 private_2;
    };

An _Unwind_Exception object must be double-word aligned. The first two fields
are set by user code prior to raising the exception, and the latter two should
never be touched except by the runtime.   
 
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