Merge pull request #36507 from Catfish-Man/theres-a-hole-at-the-end-where-the-bits-fall-out

Author: swift-ci

stdlib/public/core/StringBridge.swift

@@ -351,7 +351,9 @@ internal func _bridgeTagged(
 private func _NSStringASCIIPointer(_ str: _StringSelectorHolder) -> UnsafePointer<UInt8>? {
  // TODO(String bridging): Is there a better interface here? Ideally we'd be
   // able to ask for UTF8 rather than just ASCII
-  return str._fastCStringContents(0)?._asUInt8
+  //TODO(String bridging): Unconditionally asking for nul-terminated contents is
+  // overly conservative and hurts perf with some NSStrings
+  return str._fastCStringContents(1)?._asUInt8
 }
 
 @_effects(readonly) // @opaque