Add a test for rust-lang#2324

Author: topecongiro

tests/target/issue-2324.rs

@@ -0,0 +1,7 @@
+// nested function calls with cast.
+fn main() {
+    self.ptr
+        .set(intrinsics::arith_offset(self.ptr.get() as *mut u8, 1) as *mut T);
+    self.ptr
+        .set(intrinsics::arith_offset(self.ptr.get(), mem::size_of::<T>() as isize) as *mut u8);
+}