[clang-tidy] Fix test failing on 32-bit architectures due to missing __int128_t

This was caused by ff60af91ac. The reason for the failure is that
the type `__int128_t` is not available on 32-bit architectures. So just exclude the test case if
128-bit integers are not available.

clang-tools-extra/test/clang-tidy/checkers/bugprone-sizeof-expression.cpp

@@ -172,10 +172,7 @@ int Foo() { int A[T]; return sizeof(T); }
 template <typename T>
 int Bar() { T A[5]; return sizeof(A[0]) / sizeof(T); }
 // CHECK-MESSAGES: :[[@LINE-1]]:28: warning: suspicious usage of sizeof pointer 'sizeof(T)/sizeof(T)'
-template <__int128_t N> 
+int Test3() { return Foo<42>() + Bar<char>(); }
-bool Baz() { return sizeof(A) < N; }
-// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: suspicious comparison of 'sizeof(expr)' to a constant
-int Test3() { return Foo<42>() + Bar<char>() + Baz<-1>(); }
 
 static const char* kABC = "abc";
 static const wchar_t* kDEF = L"def";
@@ -289,6 +286,13 @@ int Test6() {
   return sum;
 }
 
+#ifdef __SIZEOF_INT128__
+template <__int128_t N> 
+bool Baz() { return sizeof(A) < N; }
+// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: suspicious comparison of 'sizeof(expr)' to a constant
+bool Test7() { return Baz<-1>(); }
+#endif
+
 int ValidExpressions() {
   int A[] = {1, 2, 3, 4};
   static const char str[] = "hello";