Merge remote-tracking branch 'origin/main' into rebranch

Author: swift-ci

include/swift/Basic/Features.def

@@ -273,6 +273,8 @@ LANGUAGE_FEATURE(NonescapableAccessorOnTrivial, 0, "Support UnsafeMutablePointer
 BASELINE_LANGUAGE_FEATURE(LayoutPrespecialization, 0, "Layout pre-specialization")
 BASELINE_LANGUAGE_FEATURE(IsolatedDeinit, 371, "isolated deinit")
 LANGUAGE_FEATURE(InlineArrayTypeSugar, 483, "Type sugar for InlineArray")
+LANGUAGE_FEATURE(LifetimeDependenceMutableAccessors, 0, "Support mutable accessors returning ~Escapable results")
+LANGUAGE_FEATURE(InoutLifetimeDependence, 0, "Support @_lifetime(&)")
 
 // Swift 6
 UPCOMING_FEATURE(ConciseMagicFile, 274, 6)
@@ -435,10 +437,6 @@ EXPERIMENTAL_FEATURE(StructLetDestructuring, true)
 /// Enable returning non-escapable types from functions.
 EXPERIMENTAL_FEATURE(LifetimeDependence, true)
 
-/// Enable inout lifetime dependence - @lifetime(&arg)
-EXPERIMENTAL_FEATURE(InoutLifetimeDependence, true)
-EXPERIMENTAL_FEATURE(LifetimeDependenceMutableAccessors, true)
-
 /// Enable the `@_staticExclusiveOnly` attribute.
 EXPERIMENTAL_FEATURE(StaticExclusiveOnly, true)
 

stdlib/public/Differentiation/ArrayDifferentiation.swift

@@ -369,8 +369,11 @@ extension Array where Element: Differentiable {
     value: [Result],
     pullback: (Array<Result>.TangentVector) -> Array.TangentVector
   ) {
+    let count = self.count
     var values: [Result] = []
     var pullbacks: [(Result.TangentVector) -> Element.TangentVector] = []
+    values.reserveCapacity(count)
+    pullbacks.reserveCapacity(count)
     for x in self {
       let (y, pb) = valueWithPullback(at: x, of: body)
       values.append(y)