Fix potential memory leak issue when using llvm::EngineBuilder().selectTarget() Fix issue of accessing aot_value's fields after it is freed Fix JIT not print failed to link import warning Change some error messages: 'fail to' to 'failed to' Update error message when SIMD isn't enabled Fix install littlevgl wasm app of wasi version failed Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>