Enable ref types feature and bulk memory feature by default for wamrc
and provide "--disable-ref-types", "--disable-bulk-memory" to disable
them.
And remove the ref_type_flag option in wasm_loader.c which is used to
control whether to enable ref types or not when ENABLE_REF_TYPES
macro is enabled in wamrc. As the wasm binary format with ref types
is compatible with the binary format before, we can remove the option.
Also update the spec test scripts.
Port spec-test-script/all.sh to spec-test-script/all.py and enable to run
spec cases with multiple threads parallelly:
- It reduces spec_test.yml from ~14min to ~9min and reduces
compilation_on_sgx.yml from ~18min to ~12min
- run `./test_wamr.sh` will keep the same experience likes before by default
- run `./test_wamr.sh -P` will enable parallelism mode
- in parallelism mode, all.py will be in a less-output mode. It only outputs
the last words of failed cases and will not output logs for those passed
