[stdlib] make annotation adjustments

Author: glessard

stdlib/public/core/StringGuts.swift

@@ -17,6 +17,7 @@ import SwiftShims
 // functionality and guidance for efficiently working with Strings.
 //
 @frozen
+@_addressableForDependencies
 public // SPI(corelibs-foundation)
 struct _StringGuts: @unchecked Sendable {
   @usableFromInline

stdlib/public/core/StringUTF8View.swift

@@ -89,7 +89,7 @@ extension String {
   ///     print(String(s1.utf8.prefix(15))!)
   ///     // Prints "They call me 'B"
   @frozen
-  @_addressableForDependencies
+  @_eagerMove
   public struct UTF8View: Sendable {
     @usableFromInline
     internal var _guts: _StringGuts

stdlib/public/core/StringUnicodeScalarView.swift

@@ -61,6 +61,7 @@ extension String {
   ///     }
   ///     // Prints "My favorite emoji is "
   @frozen
+  @_eagerMove
   public struct UnicodeScalarView: Sendable {
     @usableFromInline
     internal var _guts: _StringGuts

stdlib/public/core/Substring.swift

@@ -93,6 +93,7 @@ extension String {
 ///   substrings may, therefore, prolong the lifetime of string data that is
 ///   no longer otherwise accessible, which can appear to be memory leakage.
 @frozen
+@_eagerMove
 public struct Substring: Sendable {
   @usableFromInline
   internal var _slice: Slice<String>
@@ -630,7 +631,7 @@ extension Substring: LosslessStringConvertible {
 
 extension Substring {
   @frozen
-  @_addressableForDependencies
+  @_eagerMove
   public struct UTF8View: Sendable {
     @usableFromInline
     internal var _slice: Slice<String.UTF8View>
@@ -1004,6 +1005,7 @@ extension String {
 }
 extension Substring {
   @frozen
+  @_eagerMove
   public struct UnicodeScalarView: Sendable {
     @usableFromInline
     internal var _slice: Slice<String.UnicodeScalarView>