[6.2] Cherry-pick recent CompatibilitySpan work #80680
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6.2 cherry-pick of #80596, #80510, #80678
Description: Mostly cmake-adjacent changes for the
libswiftCompatibilitySpan.dylib
library, together with the right annotations needed to emit the$ld$previous
symbols intolibswiftCore.dylib
. Also, update theSwiftStdlib 6.1
availability macro with real version numbers now that Swift 6.1 has been officially released.Risk: Medium, just because cmake changes have caused problems in the past. Also the
$ld$previous
symbols will take effect if someone uses Span and builds for an older deployment target, but that shouldn't impact existing code.Reviewed by: @hborla