Sema: Don't emit bogus warnings about Sendable tuple conformance

lib/Sema/ResilienceDiagnostics.cpp

@@ -280,6 +280,11 @@ TypeChecker::diagnoseConformanceExportability(SourceLoc loc,
   if (!where.mustOnlyReferenceExportedDecls())
     return false;
 
+  // Skip the special Sendable and Copyable conformances we synthesized in
+  // ASTContext::getBuiltinTupleDecl().
+  if (ext->getParentModule()->isBuiltinModule())
+    return false;
+
   auto originKind = getDisallowedOriginKind(ext, where);
   if (originKind == DisallowedOriginKind::None)
     return false;

test/Sema/export_tuple_conformance.swift

@@ -0,0 +1,7 @@
+// RUN: %target-typecheck-verify-swift
+
+public struct G<T: Sendable> {}
+
+public func makeG() -> G<Void> {}
+
+// No spurious warning about use of conformance from Builtin module