AST: Promote ExpressionMacroDefaultArguments feature to baseline.

Author: tshortli

include/swift/Basic/Features.def

@@ -186,7 +186,7 @@ SUPPRESSIBLE_LANGUAGE_FEATURE(ExtensionMacroAttr, 0, "@attached(extension)")
 BASELINE_LANGUAGE_FEATURE(TypedThrows, 413, "Typed throws")
 CONDITIONALLY_SUPPRESSIBLE_LANGUAGE_FEATURE(OptionalIsolatedParameters, 420, "Optional isolated parameters")
 SUPPRESSIBLE_LANGUAGE_FEATURE(Extern, 0, "@_extern")
-LANGUAGE_FEATURE(ExpressionMacroDefaultArguments, 422, "Expression macro as caller-side default argument")
+BASELINE_LANGUAGE_FEATURE(ExpressionMacroDefaultArguments, 422, "Expression macro as caller-side default argument")
 LANGUAGE_FEATURE(BuiltinStoreRaw, 0, "Builtin.storeRaw")
 BASELINE_LANGUAGE_FEATURE(BuiltinCreateTask, 0, "Builtin.createTask and Builtin.createDiscardingTask")
 SUPPRESSIBLE_LANGUAGE_FEATURE(AssociatedTypeImplements, 0, "@_implements on associated types")

lib/AST/FeatureSet.cpp

@@ -179,18 +179,6 @@ static bool usesFeatureAssociatedTypeImplements(Decl *decl) {
   return isa<TypeDecl>(decl) && decl->getAttrs().hasAttribute<ImplementsAttr>();
 }
 
-static bool usesFeatureExpressionMacroDefaultArguments(Decl *decl) {
-  if (auto func = dyn_cast<AbstractFunctionDecl>(decl)) {
-    for (auto param : *func->getParameters()) {
-      if (param->getDefaultArgumentKind() ==
-          DefaultArgumentKind::ExpressionMacro)
-        return true;
-    }
-  }
-
-  return false;
-}
-
 UNINTERESTING_FEATURE(BuiltinStoreRaw)
 UNINTERESTING_FEATURE(BuiltinAddressOfRawLayout)
 

test/Concurrency/sending_conditional_suppression.swift

@@ -206,7 +206,7 @@ public struct TestInStruct {
 // Make sure that we emit compiler(>= 5.3) when emitting the suppressing check
 // to make sure we do not fail if we fail to parse sending in the if block.
 
-// CHECK-LABEL: #if compiler(>=5.3) && $OptionalIsolatedParameters && $ExpressionMacroDefaultArguments // Suppression Count: 24
+// CHECK-LABEL: #if compiler(>=5.3) && $OptionalIsolatedParameters // Suppression Count: 24
 // CHECK-NEXT: #if compiler(>=5.3) && $SendingArgsAndResults // Suppression Count: 25
 // CHECK-NEXT: @inlinable public func withCheckedContinuation<T>(isolation: isolated (any _Concurrency.Actor)? = #isolation, function: Swift.String = #function, _ body: (_Concurrency.CheckedContinuation<T, Swift.Never>) -> Swift.Void) async -> sending T {
 // CHECK-NEXT:   fatalError()