Merge pull request #71624 from artemcm/DepScanCxxInteropImportNo

[Dependency Scanning] Interface-scanning sub-invocations should not attempt to import `CxxShims`

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1808,6 +1808,8 @@ InterfaceSubContextDelegateImpl::InterfaceSubContextDelegateImpl(
     // in the Swift compile commands, when different.
     inheritedParentContextClangArgs =
         clangImporterOpts.getReducedExtraArgsForSwiftModuleDependency();
+    genericSubInvocation.getFrontendOptions()
+        .DependencyScanningSubInvocation = true;
   } else if (LoaderOpts.strictImplicitModuleContext) {
     // If the compiler has been asked to be strict with ensuring downstream
     // dependencies get the parent invocation's context, inherit the extra Clang