Add a mode to test implicit dynamic with private imports

Author: aschwaighofer

test/CMakeLists.txt

@@ -135,6 +135,7 @@ set(profdata_merge_worker
 
 set(TEST_MODES
     optimize_none optimize optimize_unchecked optimize_size
+    optimize_none_with_implicit_dynamic
     only_executable only_non_executable
 )
 set(TEST_SUBSETS

test/IRGen/report_dead_method_call.swift

@@ -11,6 +11,8 @@
 // RUN: %target-run %t/report_dead_method_call
 // REQUIRES: executable_test
 
+// UNSUPPORTED: swift_test_mode_optimize_none_with_implicit_dynamic
+
 private protocol PrivateProto {
 	func abc()
 }