[lldb][test] Turn std::atomic libcxx test generic

Split out from #146740

Author: Michael137

lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/atomic/Makefile renamed to lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/atomic/Makefile

@@ -1,5 +1,3 @@
 CXX_SOURCES := main.cpp
-CXXFLAGS_EXTRAS := -std=c++11
-USE_LIBCPP := 1
 
 include Makefile.rules

lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/atomic/TestLibCxxAtomic.py renamed to lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/atomic/TestStdAtomic.py

@@ -9,18 +9,15 @@
 from lldbsuite.test import lldbutil
 
 
-class LibCxxAtomicTestCase(TestBase):
+class StdAtomicTestCase(TestBase):
     def get_variable(self, name):
         var = self.frame().FindVariable(name)
         var.SetPreferDynamicValue(lldb.eDynamicCanRunTarget)
         var.SetPreferSyntheticValue(True)
         return var
 
-    @skipIf(compiler=["gcc"])
-    @add_test_categories(["libc++"])
-    def test(self):
-        """Test that std::atomic as defined by libc++ is correctly printed by LLDB"""
-        self.build()
+    def do_test(self):
+        """Test that std::atomic is correctly printed by LLDB"""
         self.runCmd("file " + self.getBuildArtifact("a.out"), CURRENT_EXECUTABLE_SET)
 
         bkpt = self.target().FindBreakpointByID(
@@ -31,8 +28,6 @@ def test(self):
 
         self.runCmd("run", RUN_SUCCEEDED)
 
-        lldbutil.skip_if_library_missing(self, self.target(), re.compile(r"libc\+\+"))
-
         # The stop reason of the thread should be breakpoint.
         self.expect(
             "thread list",
@@ -66,3 +61,15 @@ def test(self):
         self.expect(
             "frame var p.child.parent", substrs=["p.child.parent = {\n  Value = 0x"]
         )
+
+    @skipIf(compiler=["gcc"])
+    @add_test_categories(["libc++"])
+    def test_libcxx(self):
+        self.build(dictionary={"USE_LIBCPP" : 1})
+        self.do_test()
+
+    @skipIf(compiler=["gcc"])
+    @add_test_categories(["libstdcxx"])
+    def test_libstdcxx(self):
+        self.build(dictionary={"USE_LIBSTDCPP" : 1})
+        self.do_test()