Temporarily use _read and _modify

Author: Azoy

stdlib/public/core/Vector.swift

@@ -276,36 +276,17 @@ extension Vector where Element: ~Copyable {
   @_alwaysEmitIntoClient
   public subscript(_ i: Int) -> Element {
     @_transparent
-    unsafeAddress {
+    _read {
       _precondition(startIndex <= i && i < endIndex, "Index out of bounds")
 
-      return address + i
+      yield ((address + i).pointee)
     }
 
     @_transparent
-    unsafeMutableAddress {
+    _modify {
       _precondition(startIndex <= i && i < endIndex, "Index out of bounds")
 
-      return mutableAddress + i
-    }
-  }
-}
-
-@available(SwiftStdlib 6.1, *)
-extension Vector where Element: Copyable {
-  @available(SwiftStdlib 6.1, *)
-  @_alwaysEmitIntoClient
-  public subscript(_ i: Int) -> Element {
-    get {
-      _precondition(startIndex <= i && i < endIndex, "Index out of bounds")
-
-      return buffer[i]
-    }
-
-    set {
-      _precondition(startIndex <= i && i < endIndex, "Index out of bounds")
-
-      mutableBuffer[i] = newValue
+      yield &(mutableAddress + i).pointee
     }
   }
 }