[stdlib] Implement _preprocessingPass and _customContainsEquatableElement for StrideTo and StrideThrough

Author: Max Moiseev

stdlib/public/core/Stride.swift.gyb

@@ -233,6 +233,23 @@ public struct StrideTo<Element : Strideable> : Sequence, CustomReflectable {
     return StrideToIterator(_start: _start, end: _end, stride: _stride)
   }
 
+  @_inlineable
+  public func _preprocessingPass<R>(
+    _ preprocess: () throws -> R
+  ) rethrows -> R? {
+    return try preprocess()
+  }
+
+  @_inlineable
+  public func _customContainsEquatableElement(
+    _ element: Element
+  ) -> Bool? {
+    if element < _start || _end <= element {
+      return false
+    }
+    return nil
+  }
+
   @_inlineable
   @_versioned
   internal init(_start: Element, end: Element, stride: Element.Stride) {
@@ -333,6 +350,23 @@ public struct StrideThrough<
     return StrideThroughIterator(_start: _start, end: _end, stride: _stride)
   }
 
+  @_inlineable
+  public func _preprocessingPass<R>(
+    _ preprocess: () throws -> R
+  ) rethrows -> R? {
+    return try preprocess()
+  }
+
+  @_inlineable
+  public func _customContainsEquatableElement(
+    _ element: Element
+  ) -> Bool? {
+    if element < _start || _end < element {
+      return false
+    }
+    return nil
+  }
+
   @_inlineable
   @_versioned
   internal init(_start: Element, end: Element, stride: Element.Stride) {