wamrc size_level heuristic

[yamt]

currently wamrc frontend has some logic to tweak size_level.

wasm-micro-runtime/wamr-compiler/main.c

Lines 566 to 589 in a36c7d5

	if (!size_level_set) {
	/**
	* Set opt level to 1 by default for Windows and MacOS as
	* they can not memory map out 0-2GB memory and might not
	* be able to meet the requirements of some AOT relocation
	* operations.
	*/
	if (option.target_abi && !strcmp(option.target_abi, "msvc")) {
	LOG_VERBOSE("Set size level to 1 for Windows AOT file");
	option.size_level = 1;
	}
	#if defined(_WIN32) || defined(_WIN32_) || defined(__APPLE__) \
	|| defined(__MACH__)
	if (!option.target_abi) {
	LOG_VERBOSE("Set size level to 1 for Windows or MacOS AOT file");
	option.size_level = 1;
	}
	#endif
	}
	if (sgx_mode) {
	option.size_level = 1;
	option.is_sgx_platform = true;
	}

i guess it's more straightforward to do such a tweak in the backend (eg. aot_create_comp_context) instead because we have a better target knowledge there.
also, considering cross-aot-compiling, it's better to avoid decisions based on macros like _WIN32.

related: #3164