[stdlib, 6.2] Default initializers for Span-family types #82883
Merged
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Explanation:
Adds no-parameter initializers that return empty, immortal instances of Span/RawSpan/MutableSpan/MutableRawSpan.
These were accepted as part of SE-0485.
Resolves: rdar://155275054
Risk: Low. These API are
@_alwaysEmitIntoClient.Main branch PR: [stdlib] Default initializers for Span-family types #82866
Reviewed by: @stephentyrone
Testing: updated tests