Add push and pop benches (FuelLabs#1490)

FuelLabs#1446

```
poph/poph               time:   [72.373 ns 72.690 ns 73.018 ns]
popl/popl               time:   [66.444 ns 66.724 ns 67.006 ns]
pshh/pshh               time:   [76.584 ns 76.862 ns 77.133 ns]
pshl/pshl               time:   [80.093 ns 80.410 ns 80.774 ns]
```

CHANGELOG.md

@@ -10,6 +10,7 @@ Description of the upcoming release here.
 
 ### Added
 
+- [#1490](https://github.com/FuelLabs/fuel-core/pull/1490): Add push and pop benchmarks.
 - [#1485](https://github.com/FuelLabs/fuel-core/pull/1485): Prepare rc release of fuel core v0.21
 - [#1476](https://github.com/FuelLabs/fuel-core/pull/1453): Add the majority of the "other" benchmarks for contract opcodes.
 - [#1453](https://github.com/FuelLabs/fuel-core/pull/1453): Add the majority of the "sanity" benchmarks for contract opcodes.

benches/benches/vm_set/mem.rs

@@ -141,4 +141,36 @@ pub fn run(c: &mut Criterion) {
         );
     }
     mem_meq.finish();
+
+    let full_mask = (1 << 24) - 1;
+
+    // poph
+    let prepare_script = vec![op::pshh(full_mask)];
+    run_group_ref(
+        &mut c.benchmark_group("poph"),
+        "poph",
+        VmBench::new(op::poph(full_mask)).with_prepare_script(prepare_script),
+    );
+
+    // popl
+    let prepare_script = vec![op::pshl(full_mask)];
+    run_group_ref(
+        &mut c.benchmark_group("popl"),
+        "popl",
+        VmBench::new(op::popl(full_mask)).with_prepare_script(prepare_script),
+    );
+
+    // pshh
+    run_group_ref(
+        &mut c.benchmark_group("pshh"),
+        "pshh",
+        VmBench::new(op::pshh(full_mask)),
+    );
+
+    // pshl
+    run_group_ref(
+        &mut c.benchmark_group("pshl"),
+        "pshl",
+        VmBench::new(op::pshl(full_mask)),
+    );
 }