[clang][Interp] Fix up broken test case

This was not working right on armv8:
https://lab.llvm.org/buildbot/#/builders/245/builds/20020

Author: tbaederr

clang/test/AST/Interp/c.c

@@ -113,20 +113,17 @@ int somefunc(int i) {
 
 /// FIXME: The following test is incorrect in the new interpreter.
 /// The null pointer returns 16 from its getIntegerRepresentation().
+#pragma clang diagnostic ignored "-Wpointer-to-int-cast"
 struct ArrayStruct {
   char n[1];
 };
 struct AA {
-  char name2[(int)&((struct ArrayStruct*)0)->n - 1]; // expected-warning {{cast to smaller integer type}} \
-                                                     // expected-warning {{folded to constant array}} \
-                                                     // pedantic-expected-warning {{cast to smaller integer type}} \
+  char name2[(int)&((struct ArrayStruct*)0)->n - 1]; // expected-warning {{folded to constant array}} \
                                                      // pedantic-expected-warning {{folded to constant array}} \
                                                      // ref-error {{array size is negative}} \
-                                                     // ref-warning {{cast to smaller integer type}} \
-                                                     // pedantic-ref-error {{array size is negative}} \
-                                                     // pedantic-ref-warning {{cast to smaller integer type}}
+                                                     // pedantic-ref-error {{array size is negative}}
 };
 _Static_assert(sizeof(struct AA) == 15, ""); // ref-error {{failed}} \
-                                             // ref-note {{1 == 15}} \
+                                             // ref-note {{ == 15}} \
                                              // pedantic-ref-error {{failed}} \
-                                             // pedantic-ref-note {{1 == 15}}
+                                             // pedantic-ref-note {{ == 15}}