Enable aux stack allocations on application heap (#1799)

This is necessary for WASI threads as the aux stack should be managed by the application.
See https://github.com/bytecodealliance/wasm-micro-runtime/issues/1790 for details.

core/iwasm/libraries/lib-wasi-threads/lib_wasi_threads.cmake

@@ -3,7 +3,7 @@
 
 set (LIB_WASI_THREADS_DIR ${CMAKE_CURRENT_LIST_DIR})
 
-add_definitions (-DWASM_ENABLE_LIB_WASI_THREADS=1)
+add_definitions (-DWASM_ENABLE_LIB_WASI_THREADS=1 -DWASM_ENABLE_HEAP_AUX_STACK_ALLOCATION=1)
 
 include_directories(${LIB_WASI_THREADS_DIR})
 

core/iwasm/libraries/lib-wasi-threads/lib_wasi_threads_wrapper.c

@@ -4,7 +4,6 @@
  */
 
 #include "bh_log.h"
-#include "wasmtime_ssp.h"
 #include "thread_manager.h"
 
 #if WASM_ENABLE_INTERP != 0
@@ -58,9 +57,6 @@ thread_start(void *arg)
             wasm_cluster_spread_exception(exec_env);
     }
 
-    /* routine exit, destroy instance */
-    wasm_runtime_deinstantiate_internal(module_inst, true);
-
     wasm_runtime_free(thread_arg);
     exec_env->thread_arg = NULL;