[SYCL] Second approach to piDeviceRelease resource leak fix. #2671
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piDeviceRelease resource leak fix - second attempt. There is a circular dependency between the device_impl and the platform_impl, each holding a shared pointer to the other, which prevents their destruction. In this second approach, I've replaced the vector of shared pointers in the platform_impl with a vector of weak_ptr. It seems to work well. The destructors are getting called, and piDeviceRetain/Release calls are balanced.
Original draft is here: #2668
Signed-off-by: Chris Perkins [email protected]