[lldb][test] Remove failing ValueCheck on deprecated libcxx entity

A recent libcxx change renamed all internal variables starting with
`__`. As such, `std::reverse_iterator::__t` was renamed to
`std::reverse_iterator::__t_`. This breaks the `import-std-module`
tests with newer libcxx versions. Since this variable is deprecated
in libcxx anyway, this patch simply removes the explicit `ValueCheck`
on the variable name. We don't lose any interesting test-case here
since the purpose of the test is to see if we can call functions
from the `std` module.

We can now re-enable the tests on Darwin for all buildbot Clang
compiler variants.

Differential Revision: https://reviews.llvm.org/D134727

Author: Michael137

lldb/test/API/commands/expression/import-std-module/deque-basic/TestDequeFromStdModule.py

@@ -10,7 +10,6 @@
 class TestBasicDeque(TestBase):
 
     @add_test_categories(["libc++"])
-    @expectedFailureDarwin # FIXME: May need to force system libcxx here.
     @skipIf(compiler=no_match("clang"))
     def test(self):
         self.build()
@@ -31,7 +30,7 @@ def test(self):
         ]
         riterator = "reverse_iterator"
         riterator_children = [
-            ValueCheck(name="__t"),
+            ValueCheck(), # Deprecated __t_ member; no need to check
             ValueCheck(name="current")
         ]
 

lldb/test/API/commands/expression/import-std-module/deque-dbg-info-content/TestDbgInfoContentDequeFromStdModule.py

@@ -10,7 +10,6 @@
 class TestDbgInfoContentDeque(TestBase):
 
     @add_test_categories(["libc++"])
-    @expectedFailureDarwin # FIXME: May need to force system libcxx here.
     @skipIf(compiler=no_match("clang"))
     def test(self):
         self.build()
@@ -33,7 +32,7 @@ def test(self):
 
         riterator_type = "reverse_iterator"
         riterator_children = [
-            ValueCheck(name="__t"),
+            ValueCheck(), # Deprecated __t_ member; no need to check
             ValueCheck(name="current")
         ]
 

lldb/test/API/commands/expression/import-std-module/vector-dbg-info-content/TestDbgInfoContentVectorFromStdModule.py

@@ -11,7 +11,6 @@
 class TestDbgInfoContentVector(TestBase):
 
     @add_test_categories(["libc++"])
-    @expectedFailureDarwin # FIXME: May need to force system libcxx here.
     @skipIf(compiler=no_match("clang"))
     def test(self):
         self.build()
@@ -30,7 +29,7 @@ def test(self):
         iterator_children = [ValueCheck(name="item")]
         riterator = "reverse_iterator"
         riterator_children = [
-            ValueCheck(name="__t"),
+            ValueCheck(), # Deprecated __t_ member; no need to check
             ValueCheck(name="current")
         ]
 

lldb/test/API/commands/expression/import-std-module/vector/TestVectorFromStdModule.py

@@ -10,7 +10,6 @@
 class TestBasicVector(TestBase):
 
     @add_test_categories(["libc++"])
-    @expectedFailureDarwin # FIXME: May need to force system libcxx here.
     @skipIf(compiler=no_match("clang"))
     def test(self):
         self.build()
@@ -29,7 +28,7 @@ def test(self):
         iterator_children = [ValueCheck(name="item")]
         riterator = "reverse_iterator"
         riterator_children = [
-            ValueCheck(name="__t"),
+            ValueCheck(), # Deprecated __t_ member; no need to check
             ValueCheck(name="current")
         ]