Test case which displays problem found in libstdc++-v3 effort

[Jason Merrill]

>>>>> Alan Modra <alan@linuxcare.com.au> writes:

 > What this all means is that .eh_frame definitely needs to be marked KEEP
 > in the linker script (and my comment about a linker bug is wrong).  You
 > won't get all .eh_frame input sections in the output just because there is
 > a reference to one of them.

This makes sense.  Thanks!

Jason