[PATCH] libstdc++: centralize and improve testing of shared_ptr/weak_ptr conversions

[Giuseppe D'Angelo]

Hi,

The attached patch is a cleanup and improvement of a test that I've 
added in r15-8048-gdf0e6509bf7442. Since the test is identical for 
shared_ptr and weak_ptr, I've centralized it to reduce future 
maintenance, and extended it to cover more cases.

Thank you,
-- 
Giuseppe D'Angelo
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