Add test to check if -enable-ossa-modules is inherited by its dependencies

Author: meg-gupta

test/ScanDependencies/enable-ossa-modules-pass-down.swift

@@ -0,0 +1,21 @@
+// REQUIRES: objc_interop
+// RUN: %empty-directory(%t)
+// RUN: mkdir -p %t/clang-module-cache
+// RUN: mkdir -p %t/Frameworks
+// RUN: mkdir -p %t/Frameworks/E.framework/
+// RUN: mkdir -p %t/Frameworks/E.framework/Modules
+// RUN: mkdir -p %t/Frameworks/E.framework/Modules/E.swiftmodule
+
+// Copy over the interface
+// RUN: cp %S/Inputs/Swift/E.swiftinterface %t/Frameworks/E.framework/Modules/E.swiftmodule/%module-target-triple.swiftinterface
+
+// Run the scan
+// RUN: %target-swift-frontend -scan-dependencies -enable-ossa-modules -disable-implicit-swift-modules -module-load-mode prefer-interface %s -o %t/deps.json -F %t/Frameworks/ -sdk %t
+// RUN: %validate-json %t/deps.json | %FileCheck %s
+
+import E
+
+// CHECK: E.swiftmodule/{{.*}}.swiftinterface
+// CHECK: "commandLine": [
+// CHECK: "-enable-ossa-modules"
+// CHECK: ]