Support for deinit of opaque existentials: deinit_existential_opaque instruction + SILGen support #7796
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Small part of radar rdar://problem/30080769
Bootstrapping SILGen for opaque values - This PR adds support for deinit_existential instruction that takes an opaque value + corresponding test-case.
Worth noting: while support has been added (almost) everywhere, including our utilities, The SIL Optimizer passes have not been changed / asked to make any special considerations for this new instruction.