Enable more tests on AArch64 (#2994)

Copyright (c) 2021, Arm Limited.

crates/runtime/src/instance/allocator/pooling.rs

@@ -1666,10 +1666,14 @@ mod test {
         );
     }
 
-    #[cfg_attr(target_arch = "aarch64", ignore)] // https://github.com/bytecodealliance/wasmtime/pull/2518#issuecomment-747280133
     #[cfg(all(unix, target_pointer_width = "64", feature = "async"))]
     #[test]
     fn test_stack_zeroed() -> Result<()> {
+        // https://github.com/bytecodealliance/wasmtime/pull/2518#issuecomment-747280133
+        if std::env::var("WASMTIME_TEST_NO_HOG_MEMORY").is_ok() {
+            return Ok(());
+        }
+
         let allocator = PoolingInstanceAllocator::new(
             PoolingAllocationStrategy::NextAvailable,
             ModuleLimits {