AST: Promote BitwiseCopyable feature to baseline.

Author: tshortli

include/swift/Basic/Features.def

@@ -192,7 +192,7 @@ BASELINE_LANGUAGE_FEATURE(BuiltinCreateTask, 0, "Builtin.createTask and Builtin.
 SUPPRESSIBLE_LANGUAGE_FEATURE(AssociatedTypeImplements, 0, "@_implements on associated types")
 LANGUAGE_FEATURE(BuiltinAddressOfRawLayout, 0, "Builtin.addressOfRawLayout")
 BASELINE_LANGUAGE_FEATURE(MoveOnlyPartialConsumption, 429, "Partial consumption of noncopyable values")
-LANGUAGE_FEATURE(BitwiseCopyable, 426, "BitwiseCopyable protocol")
+BASELINE_LANGUAGE_FEATURE(BitwiseCopyable, 426, "BitwiseCopyable protocol")
 BASELINE_LANGUAGE_FEATURE(NoncopyableGenerics, 427, "Noncopyable generics")
 BASELINE_LANGUAGE_FEATURE(NoncopyableGenerics2, 427, "Noncopyable generics alias")
 SUPPRESSIBLE_LANGUAGE_FEATURE(ConformanceSuppression, 426, "Suppressible inferred conformances")

lib/AST/FeatureSet.cpp

@@ -249,7 +249,6 @@ static bool usesFeatureExtractConstantsFromMembers(Decl *decl) {
   return decl->getAttrs().hasAttribute<ExtractConstantsFromMembersAttr>();
 }
 
-UNINTERESTING_FEATURE(BitwiseCopyable)
 UNINTERESTING_FEATURE(FixedArrays)
 UNINTERESTING_FEATURE(GroupActorErrors)