Merge pull request #76378 from cachemeifyoucan/eng/PR-135611011

[Modules] Make SubInstance spawn correctly under DirectCC1Mode

Author: cachemeifyoucan

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1953,9 +1953,13 @@ InterfaceSubContextDelegateImpl::InterfaceSubContextDelegateImpl(
     genericSubInvocation.getFrontendOptions()
         .DependencyScanningSubInvocation = true;
   } else if (LoaderOpts.strictImplicitModuleContext ||
-             // Explicit module Interface verification jobs still spawn a sub-instance
-             // and we must ensure this sub-instance gets all of the Xcc flags.
-             LoaderOpts.disableImplicitSwiftModule) {
+             // Explicit module Interface verification jobs still spawn a
+             // sub-instance and we must ensure this sub-instance gets all of
+             // the Xcc flags.
+             LoaderOpts.disableImplicitSwiftModule ||
+             // If using direct cc1 argument mode for lldb or typecheck
+             // interface, inherit all clang arguments.
+             clangImporterOpts.DirectClangCC1ModuleBuild) {
     // If the compiler has been asked to be strict with ensuring downstream
     // dependencies get the parent invocation's context, inherit the extra Clang
     // arguments also. Inherit any clang-specific state of the compilation