Import WAMR Fast JIT (#1343)

Import WAMR Fast JIT which is a lightweight JIT with quick startup, small footprint,
relatively good performance (~40% to ~50% of LLVM JIT) and good portability.

Platforms supported: Linux, MacOS and Linux SGX.
Arch supported: x86-64.

core/iwasm/fast-jit/jit_codecache.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2021 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _JIT_CODE_CACHE_H_
+#define _JIT_CODE_CACHE_H_
+
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool
+jit_code_cache_init(uint32 code_cache_size);
+
+void
+jit_code_cache_destroy();
+
+void *
+jit_code_cache_alloc(uint32 size);
+
+void
+jit_code_cache_free(void *ptr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _JIT_CODE_CACHE_H_ */