Re: [apache/incubator-teaclave-sgx-sdk] Support stable rust? (#315)

[Cheng XU <no...@github.com.INVALID>]

@dingelish Any chance to merge https://github.com/apache/incubator-teaclave-sgx-sdk/tree/stable-support into the master branch?

Furthermore, is it possible to bump the compiler support to the latest nightly?

I saw the following error and warning when compiling with the latest nightly.
```
error[E0432]: unresolved import `core::alloc::AllocRef`
  --> /[snip]/incubator-teaclave-sgx-sdk/sgx_alloc/src/system.rs:26:17
   |
26 |     AllocError, AllocRef, GlobalAlloc, Layout,
   |                 ^^^^^^^^ no `AllocRef` in `alloc`
```

```
warning: use of deprecated associated function `std::sync::atomic::AtomicI32::compare_and_swap`: Use `compare_exchange` or `compare_exchange_weak` instead
  --> /[snip]/incubator-teaclave-sgx-sdk/sgx_urts/src/event.rs:42:32
   |
42 |                     self.event.compare_and_swap(-1, 0, Ordering::SeqCst);
   |                                ^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default
```

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