[stdlib] Implement SE-147: Move initialize(from:) from Pointer to BufferPointer #760
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This is a coordinated change with this PR on the Swift repo.
Since
UnsafeMutablePointer.initialize(from:)is memory-unsafe with collections that underreport their count, it is being migrated to be onUnsafeMutableBufferPointerto avoid buffer overruns.As part of this,
Sequence. _copyContents(initializing:)is being altered to take a buffer not a pointer. This is an internal underscore protocol so not user-impacting, but corelibs-foundation does use it and needs to change at the same time.