Add a test for accessing private properties of resilient objects.

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp

@@ -3429,7 +3429,8 @@ swift::ASTContext *SwiftASTContext::GetASTContext() {
   // 1. Create and install the memory buffer serialized module loader.
   std::unique_ptr<swift::ModuleLoader> memory_buffer_loader_ap(
       swift::MemoryBufferSerializedModuleLoader::create(
-          *m_ast_context_ap, m_dependency_tracker.get(), loading_mode));
+          *m_ast_context_ap, m_dependency_tracker.get(), loading_mode,
+          /*IgnoreSwiftSourceInfo*/ false, /*BypassResilience*/ true));
   if (memory_buffer_loader_ap) {
     m_memory_buffer_module_loader =
         static_cast<swift::MemoryBufferSerializedModuleLoader *>(

lldb/test/API/lang/swift/resilience_private_field/Makefile

@@ -0,0 +1,4 @@
+SWIFT_SOURCES := main.swift
+SWIFTFLAGS_EXTRAS := -enable-library-evolution
+
+include Makefile.rules

lldb/test/API/lang/swift/resilience_private_field/TestSwiftResiliencePrivateField.py

@@ -0,0 +1,19 @@
+import lldb
+from lldbsuite.test.decorators import *
+import lldbsuite.test.lldbtest as lldbtest
+import lldbsuite.test.lldbutil as lldbutil
+import unittest2
+
+
+class TestSwiftResiliencePrivateField(lldbtest.TestBase):
+
+    mydir = lldbtest.TestBase.compute_mydir(__file__)
+
+    @swiftTest
+    def test(self):
+        self.build()
+        target, process, thread, bkpt = lldbutil.run_to_source_breakpoint(
+            self, 'break here', lldb.SBFileSpec('main.swift'))
+
+        self.expect("frame variable -- self.m", substrs=['42'])
+        self.expect("expression -- m", substrs=['42'])

lldb/test/API/lang/swift/resilience_private_field/main.swift

@@ -0,0 +1,9 @@
+public class C {
+    private var m: Int
+    public func use_m() {
+      print(m) // break here
+    }
+    public init() { m = 42 }
+}
+
+C().use_m()