Print "conformances" in extension macro role

Fixes rdar://112297735.

Author: DougGregor

lib/AST/Attr.cpp

@@ -1383,6 +1383,23 @@ bool DeclAttribute::printImpl(ASTPrinter &Printer, const PrintOptions &Options,
     }
     Printer << "(";
     Printer << getMacroRoleString(Attr->getMacroRole());
+
+    // Print conformances, if present.
+    auto conformances = evaluateOrDefault(
+        D->getASTContext().evaluator,
+        ResolveExtensionMacroConformances{Attr, D},
+        {});
+    if (!conformances.empty()) {
+      Printer << ", conformances: ";
+      interleave(conformances,
+                 [&](Type type) {
+                   type.print(Printer, Options);
+                 },
+                 [&] {
+                   Printer << ", ";
+                 });
+    }
+
     if (!Attr->getNames().empty()) {
       Printer << ", names: ";
       interleave(

test/ModuleInterface/macros.swift

@@ -50,11 +50,11 @@
 @attached(accessor, names: named(init)) public macro AccessorInitFunc() = #externalMacro(module: "SomeModule", type: "AccessorInitFuncMacro")
 
 // CHECK: #if compiler(>=5.3) && $Macros && $AttachedMacros
-// CHECK: @attached(extension) @attached(conformance) public macro AddSendable() = #externalMacro(module: "SomeModule", type: "SendableExtensionMacro")
+// CHECK: @attached(extension, conformances: Swift.Sendable) @attached(conformance) public macro AddSendable() = #externalMacro(module: "SomeModule", type: "SendableExtensionMacro")
 // CHECK-NEXT: #else
 // CHECK: @attached(conformance) public macro AddSendable() = #externalMacro(module: "SomeModule", type: "SendableExtensionMacro")
 // CHECK-NEXT: #endif
-@attached(extension) @attached(conformance) public macro AddSendable() = #externalMacro(module: "SomeModule", type: "SendableExtensionMacro")
+@attached(extension, conformances: Sendable) @attached(conformance) public macro AddSendable() = #externalMacro(module: "SomeModule", type: "SendableExtensionMacro")
 
 // CHECK-NOT: internalStringify
 @freestanding(expression) macro internalStringify<T>(_ value: T) -> (T, String) = #externalMacro(module: "SomeModule", type: "StringifyMacro")