Rollup merge of #79227 - sasurau4:test/move-cell-test-to-lib-core, r=jyn514

Remove const_fn_feature_flags test

## Overview

Helps with #76268

I found `const_fn_feature_flags` is targeting feature-gate and remove it.

r? ``@matklad``
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Mara Bos 2020-12-01 10:50:12 +00:00 committed by GitHub
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@ -1,13 +0,0 @@
// run-pass
// Test use of stabilized const fns in std formerly using individual feature gates.
use std::cell::Cell;
const CELL: Cell<i32> = Cell::new(42);
fn main() {
let v = CELL.get();
CELL.set(v+1);
assert_eq!(CELL.get(), v);
}