Update availability of Span projections

Author: glessard

Sources/FoundationEssentials/Data/Data.swift

@@ -2203,7 +2203,8 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         return try _representation.withUnsafeBytes(body)
     }
 
-    @available(FoundationSpan 6.2, *)
+    @available(macOS 10.14.4, iOS 12.2, watchOS 5.2, tvOS 12.2, *)
+    @_alwaysEmitIntoClient
     public var bytes: RawSpan {
         @lifetime(borrow self)
         borrowing get {
@@ -2230,7 +2231,8 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         }
     }
 
-    @available(FoundationSpan 6.2, *)
+    @available(macOS 10.14.4, iOS 12.2, watchOS 5.2, tvOS 12.2, *)
+    @_alwaysEmitIntoClient
     public var span: Span<UInt8> {
         @lifetime(borrow self)
         borrowing get {
@@ -2239,7 +2241,8 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         }
     }
 
-    @available(FoundationSpan 6.2, *)
+    @available(macOS 10.14.4, iOS 12.2, watchOS 5.2, tvOS 12.2, *)
+    @_alwaysEmitIntoClient
     public var mutableBytes: MutableRawSpan {
         @lifetime(&self)
         mutating get {
@@ -2266,7 +2269,8 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         }
     }
 
-    @available(FoundationSpan 6.2, *)
+    @available(macOS 10.14.4, iOS 12.2, watchOS 5.2, tvOS 12.2, *)
+    @_alwaysEmitIntoClient
     public var mutableSpan: MutableSpan<UInt8> {
         @lifetime(&self)
         mutating get {