[5.10][SE-0331][stdlib] Mark unsafe pointer conformances to Sendable as explicitly unavailable #69136
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Cherry-pick of #69114
This is a preferred way to make sure that Sendable inference doesn't
happen for these types (as described in SE-0331) because they are
marked as
@frozen
.Scope: Passing unsafe pointers across concurrency domains.
Main Branch PR: [SE-0331][stdlib] Mark unsafe pointer conformances to Sendable as explicitly unavailable #69114
Resolves: rdar://101980108
Risk: Low
Reviewed By: @ktoso @hborla
Testing: added test-cases to the test suite.