e2a86d9081
Detect both at compile time and runtime for memfd_create support and disable dual code mapping if not available. Change-Id: I6908e6c116a60218bb5002378470011dfe76a257 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96845 Commit-Queue: Régis Crelier <regis@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>