make ptr_mask codegen test more specific

Author: WaffleLapkin

src/test/codegen/intrinsics/mask.rs

@@ -1,7 +1,11 @@
 #![crate_type = "lib"]
 #![feature(core_intrinsics)]
 
+// CHECK-LABEL: @mask_ptr
+// CHECK-SAME: [[WORD:i[0-9]+]] %mask
+#[no_mangle]
 pub fn mask_ptr(ptr: *const u8, mask: usize) -> *const u8 {
-    // CHECK: llvm.ptrmask
+    // CHECK: call
+    // CHECK-SAME: @llvm.ptrmask.p0isVoid.[[WORD]](
     core::intrinsics::ptr_mask(ptr, mask)
 }