[lldb] Add an expression evaluation test for modules built with

-enable-testing and -enable-library-evolution

-enable-testing affects the visibility of types, which together with
-enable-library-evolution may cause the compiler embedded in LLDB to
generate incorrect code on expression evaluation.

lldb/test/API/lang/swift/enable_testing/Makefile

@@ -0,0 +1,22 @@
+SWIFT_SOURCES := main.swift
+
+all:  libPublic.dylib a.out
+
+include Makefile.rules
+LD_EXTRAS = -lPublic -L$(BUILDDIR)
+SWIFTFLAGS_EXTRAS = -I$(BUILDDIR)
+
+libPublic.dylib: Public.swift
+	"$(MAKE)" MAKE_DSYM=YES CC=$(CC) SWIFTC=$(SWIFTC) \
+		ARCH=$(ARCH) DSYMUTIL=$(DSYMUTIL) \
+		BASENAME=Public \
+		SWIFTFLAGS_EXTRAS="-I$(BUILDDIR) -enable-library-evolution -enable-testing" \
+		VPATH=$(SRCDIR) -I $(SRCDIR) \
+		DYLIB_ONLY:=YES DYLIB_NAME=Public \
+		DYLIB_SWIFT_SOURCES:=Public.swift \
+		-f $(MAKEFILE_RULES)
+
+clean::
+	"$(MAKE)" BASENAME=Public VPATH=$(SRCDIR) -I $(SRCDIR) -f $(SRCDIR)/dylib.mk clean
+
+

lldb/test/API/lang/swift/enable_testing/Public.swift

@@ -0,0 +1,15 @@
+class SomeClass {
+    let value = 42
+}
+
+class ClassWithProperty {
+    private var v = SomeClass()
+
+    func f() {
+        print(v) // break here
+    }
+}
+
+public func entry() {
+    ClassWithProperty().f()
+}

lldb/test/API/lang/swift/enable_testing/TestSwiftEnableTesting.py

@@ -0,0 +1,21 @@
+import lldb
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+import lldbsuite.test.lldbutil as lldbutil
+
+
+class TestSwiftEnableTesting(TestBase):
+
+    def setUp(self):
+        TestBase.setUp(self)
+
+    @swiftTest
+    def test(self):
+        """Test that expression evaluation generates a direct member access to a private property in a module compiled with -enable-library-evolution and -enable-testing"""
+
+        self.build()
+        target, process, _, _ = lldbutil.run_to_source_breakpoint(
+            self, "break here", lldb.SBFileSpec("Public.swift"), extra_images=["Public"]
+        )
+
+        self.expect("expression v", substrs=["Public.SomeClass", "value = 42"])

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

@@ -0,0 +1,3 @@
+import Public
+
+entry()