ModuleInterface: allow blocklist to configure module names from SDKs that we use textual interfaces exclusively

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -236,6 +236,7 @@ struct ModuleRebuildInfo {
     PublicFramework,
     InterfacePreferred,
     CompilerHostModule,
+    Blocklisted,
   };
   struct CandidateModule {
     std::string path;
@@ -758,6 +759,14 @@ class ModuleInterfaceLoaderImpl {
     // Should we attempt to load a swiftmodule adjacent to the swiftinterface?
     bool shouldLoadAdjacentModule = !ctx.IgnoreAdjacentModules;
 
+    if (modulePath.contains(".sdk")) {
+      if (ctx.blockListConfig.hasBlockListAction(moduleName,
+          BlockListKeyKind::ModuleName, BlockListAction::ShouldUseTextualModule)) {
+        shouldLoadAdjacentModule = false;
+        rebuildInfo.addIgnoredModule(modulePath, ReasonIgnored::Blocklisted);
+      }
+    }
+
     // Don't use the adjacent swiftmodule for frameworks from the public
     // Frameworks folder of the SDK.
     if (isInSystemFrameworks(modulePath, /*publicFramework*/true)) {