AST: Promote NewCxxMethodSafetyHeuristics feature to baseline.

Author: tshortli

include/swift/Basic/Features.def

@@ -161,7 +161,7 @@ BASELINE_LANGUAGE_FEATURE(BuiltinUnprotectedStackAlloc, 0, "Builtin.unprotectedS
 BASELINE_LANGUAGE_FEATURE(BuiltinAllocVector, 0, "Builtin.allocVector")
 BASELINE_LANGUAGE_FEATURE(BuiltinTaskRunInline, 0, "Builtin.taskRunInline")
 BASELINE_LANGUAGE_FEATURE(BuiltinUnprotectedAddressOf, 0, "Builtin.unprotectedAddressOf")
-LANGUAGE_FEATURE(NewCxxMethodSafetyHeuristics, 0, "Only import C++ methods that return pointers (projections) on owned types as unsafe")
+BASELINE_LANGUAGE_FEATURE(NewCxxMethodSafetyHeuristics, 0, "Only import C++ methods that return pointers (projections) on owned types as unsafe")
 SUPPRESSIBLE_LANGUAGE_FEATURE(SpecializeAttributeWithAvailability, 0, "@_specialize attribute with availability")
 BASELINE_LANGUAGE_FEATURE(BuiltinAssumeAlignment, 0, "Builtin.assumeAlignment")
 BASELINE_LANGUAGE_FEATURE(BuiltinCreateTaskGroupWithFlags, 0, "Builtin.createTaskGroupWithFlags")

lib/AST/FeatureSet.cpp

@@ -49,10 +49,6 @@ static bool usesTypeMatching(Decl *decl, llvm::function_ref<bool(Type)> fn) {
 #define UNINTERESTING_FEATURE(FeatureName)                                     \
   static bool usesFeature##FeatureName(Decl *decl) { return false; }
 
-static bool usesFeatureNewCxxMethodSafetyHeuristics(Decl *decl) {
-  return decl->hasClangNode();
-}
-
 static bool usesFeatureSpecializeAttributeWithAvailability(Decl *decl) {
   if (auto func = dyn_cast<AbstractFunctionDecl>(decl)) {
     for (auto specialize : func->getAttrs().getAttributes<SpecializeAttr>()) {