Migrate test from llvm/test/FrontendC++.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137766 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenCXX/m64-ptr.cpp

@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 %s -emit-llvm -triple x86_64-apple-darwin -o - | FileCheck %s
+
+// Make sure pointers are passed as pointers, not converted to int.
+// The first load should be of type i8** in either 32 or 64 bit mode.
+// This formerly happened on x86-64, 7375899.
+
+class StringRef {
+public:
+  const char *Data;
+  long Len;
+};
+void foo(StringRef X);
+void bar(StringRef &A) {
+// CHECK: @_Z3barR9StringRef
+// CHECK: load i8**
+  foo(A);
+// CHECK: ret void
+}