make check lines for int/ptr common prim test more permissive

It seems that LLVM 17 doesn't fully optimize out unwrap_unchecked.

We can just loosen the check lines to account for this, since we don't
really care about the exact instructions, we just want to make sure that
inttoptr/ptrtoint aren't used for Box.

tests/codegen/common_prim_int_ptr.rs

@@ -28,16 +28,16 @@ pub fn insert_box(x: Box<()>) -> Result<usize, Box<()>> {
 // CHECK-LABEL: @extract_int
 #[no_mangle]
 pub unsafe fn extract_int(x: Result<usize, Box<()>>) -> usize {
-    // CHECK: start:
-    // CHECK-NEXT: ptrtoint
-    // CHECK-NEXT: ret
+    // CHECK: ptrtoint
     x.unwrap_unchecked()
 }
 
 // CHECK-LABEL: @extract_box
 #[no_mangle]
 pub unsafe fn extract_box(x: Result<usize, Box<()>>) -> Box<()> {
-    // CHECK: start:
-    // CHECK-NEXT: ret ptr
+    // CHECK-NOT: ptrtoint
+    // CHECK-NOT: inttoptr
+    // CHECK-NOT: load
+    // CHECK-NOT: store
     x.unwrap_err_unchecked()
 }