Implement suspend flags as atomic variable (#2361)

We have observed a significant performance degradation after merging
https://github.com/bytecodealliance/wasm-micro-runtime/pull/1991
Instead of protecting suspend flags with a mutex, we implement the flags
as atomic variable and only use mutex when atomics are not available
on a given platform.

core/shared/utils/bh_platform.h

@@ -16,6 +16,7 @@
 #include "bh_log.h"
 #include "bh_queue.h"
 #include "bh_vector.h"
+#include "gnuc.h"
 #include "runtime_timer.h"
 
 /**

core/shared/utils/gnuc.h

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2023 Amazon.com, Inc. or its affiliates. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#if !defined(__GNUC_PREREQ) && (defined(__GNUC__) || defined(__GNUG__)) \
+    && !defined(__clang__) && defined(__GNUC_MINOR__)
+/* Depending on the platform the macro is defined in sys/features.h or
+   features.h Given the macro is simple, we re-implement it here instead of
+   dealing with two different paths.
+ */
+#define __GNUC_PREREQ(maj, min) \
+    ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#endif