Adding a test case for serializing a struct with ptrauth field.

Author: qiongsiwu

clang/test/Modules/ptrauth_struct.c

@@ -0,0 +1,36 @@
+// Test serializing a module that contains a struct
+// with a ptrauth qualified field.
+
+// RUN: rm -rf %t && mkdir %t
+// RUN: split-file %s %t
+
+// The command below should not crash.
+// RUN: %clang_cc1  -triple arm64e-apple-macosx -fptrauth-returns \
+// RUN:   -fptrauth-intrinsics -fptrauth-calls -fptrauth-indirect-gotos \
+// RUN:   -fptrauth-auth-traps -fmodules -fimplicit-module-maps \
+// RUN:   -fmodules-cache-path=%t/cache -o %t/tu.o -x c %t/tu.c
+
+//--- tu.c
+#include "struct_with_ptrauth_field.h"
+
+int foo(struct T *t) {
+    return t->s.foo(t->s.v, t->s.v) + t->arr[12];
+}
+
+//--- struct_with_ptrauth_field.h
+typedef int (* FuncTy) (int, int);
+
+struct S{
+    FuncTy __ptrauth(0, 1, 1234) foo;
+    int v;
+};
+
+struct T {
+  struct S s;
+  char arr[64];
+};
+
+//--- module.modulemap
+module mod1 {
+  header "struct_with_ptrauth_field.h"
+}