AST: Promote BuiltinAddressOfRawLayout to baseline.

Author: tshortli

include/swift/Basic/Features.def

@@ -190,7 +190,7 @@ BASELINE_LANGUAGE_FEATURE(ExpressionMacroDefaultArguments, 422, "Expression macr
 BASELINE_LANGUAGE_FEATURE(BuiltinStoreRaw, 0, "Builtin.storeRaw")
 BASELINE_LANGUAGE_FEATURE(BuiltinCreateTask, 0, "Builtin.createTask and Builtin.createDiscardingTask")
 BASELINE_LANGUAGE_FEATURE(AssociatedTypeImplements, 0, "@_implements on associated types")
-LANGUAGE_FEATURE(BuiltinAddressOfRawLayout, 0, "Builtin.addressOfRawLayout")
+BASELINE_LANGUAGE_FEATURE(BuiltinAddressOfRawLayout, 0, "Builtin.addressOfRawLayout")
 BASELINE_LANGUAGE_FEATURE(MoveOnlyPartialConsumption, 429, "Partial consumption of noncopyable values")
 BASELINE_LANGUAGE_FEATURE(BitwiseCopyable, 426, "BitwiseCopyable protocol")
 BASELINE_LANGUAGE_FEATURE(NoncopyableGenerics, 427, "Noncopyable generics")

lib/AST/FeatureSet.cpp

@@ -63,8 +63,6 @@ static bool usesFeatureSpecializeAttributeWithAvailability(Decl *decl) {
   return false;
 }
 
-UNINTERESTING_FEATURE(BuiltinAddressOfRawLayout)
-
 // ----------------------------------------------------------------------------
 // MARK: - Upcoming Features
 // ----------------------------------------------------------------------------

stdlib/public/Synchronization/Cell.swift

@@ -28,11 +28,7 @@ internal struct _Cell<Value: ~Copyable>: ~Copyable {
   @_alwaysEmitIntoClient
   @_transparent
   internal var _rawAddress: Builtin.RawPointer {
-#if $BuiltinAddressOfRawLayout
     Builtin.addressOfRawLayout(self)
-#else
-    fatalError()
-#endif
   }
 
   @available(SwiftStdlib 6.0, *)