Fix CCN8924

The warning complains about passing an argument of non-POD type through
the following helper defined by Google Test:

```
static char (&Helper(...))[2];  // NOLINT
```

xlC for some reason does not like passing the non-POD type through this
helper, although it appears to work correctly. This helper is used for
statically determining whether types are implicitly covertable so all
we care about is whether `sizeof` this helper is 1 or 2. Whether the
type is passed through elipsis or as a parameter does not matter in this
case and hence we can just silence the warning on xlC.

```
CCN8924 (W) Cannot pass an argument of non-POD class type "const ASTNodeArg" through ellipsis.
```

fvtest/tril/test/ASTTest.cpp

@@ -23,10 +23,6 @@
 #include <gtest/gtest.h>
 #include "ast.hpp"
 
-#if defined(AIXPPC) || defined(J9ZOS390)
-#pragma report(disable, "CCN8924")
-#endif
-
 TEST(ASTValueTest, CreateInt64ASTValue) {
    auto baseValue = 3UL;
 
@@ -620,7 +616,3 @@ TEST(ASTNodeTest, GetSecondNamedArgumentTest) {
    argList = argList->next->next;
    ASSERT_EQ(*argList, *arg);
 }
-
-#if defined(AIXPPC) || defined(J9ZOS390)
-#pragma report(enable, "CCN8924")
-#endif

third_party/gtest-1.8.0/include/gtest/internal/gtest-internal.h

@@ -888,8 +888,14 @@ class ImplicitlyConvertible {
   // possible loss of data, so we need to temporarily disable the
   // warning.
   GTEST_DISABLE_MSC_WARNINGS_PUSH_(4244)
+#if defined(J9ZOS390) || defined(AIXPPC)
+#pragma report(disable, "CCN8924")
+#endif
   static const bool value =
       sizeof(Helper(ImplicitlyConvertible::MakeFrom())) == 1;
+#if defined(J9ZOS390) || defined(AIXPPC)
+#pragma report(enable, "CCN8924")
+#endif
   GTEST_DISABLE_MSC_WARNINGS_POP_()
 #endif  // __BORLANDC__
 };