[lldb] Remove GCC XFAIL for TestCPPAuto and TestClassTemplateParameterPack

Both tests are passing for GCC>8 on Linux so let's mark them as passing.

TestCPPAuto was originally disabled due to "an problem with debug info generation"
in ea35dbeff2 .

TestClassTemplateParameterPack was disabled without explanation in
0f01fb39e3 .

lldb/test/API/lang/cpp/auto/TestCPPAuto.py

@@ -11,9 +11,6 @@ class CPPAutoTestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
-    @expectedFailureAll(
-        compiler="gcc",
-        bugnumber="GCC generates incomplete debug info")
     def test_with_run_command(self):
         """Test that auto types work in the expression parser"""
         self.build()

lldb/test/API/lang/cpp/class-template-parameter-pack/TestClassTemplateParameterPack.py

@@ -7,7 +7,6 @@ class TestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
-    @expectedFailureAll(compiler="gcc")
     def test(self):
         self.build()
         lldbutil.run_to_source_breakpoint(self, "// break here", lldb.SBFileSpec("main.cpp"))