Fix missing symbols when using aot mode on riscv platforms. (#3731)

[Kvencc]

Fix missing symbols when using AOT mode on RISCV platforms.

If the target platform does not support the “Atomic Instructions” or “Integer Multiplication and Division” features, or does not turn on support for these CPU features when using wamrc to compile the aot file.

Just add these two macros when compiling iwasm:

• ARCH_RISCV_COMPILE_AOT_WITHOUT_FEATURE_A=1
• ARCH_RISCV_COMPILE_AOT_WITHOUT_FEATURE_M=1

[no1wudi]

Could you please describe the specific use case?

In my view, if the purpose is to detect whether atomic or multiplication/division instructions are supported, one can use the built-in macros in GCC to identify this without the need for additional configurations.

[Kvencc]

Yes, you have a point. The current processing really isn't necessary.
In that case, it seems like just adding the missing atomic operation symbols and __floatdisf.

Is this a good way to handle it?

[no1wudi]

Is this a good way to handle it?

Yes, I think something like __riscv_atomic is enough to handle it

[wenyongh]

The build_iwasm_on_nuttx CI reported errors:

https://github.com/bytecodealliance/wasm-micro-runtime/actions/runs/11052682397/job/30739828374

How about changing to below lines to have a try:

bool __atomic_compare_exchange_4(volatile void *, void *, unsigned int,
                                 bool, int, int);
void __atomic_store_4(volatile void *, unsigned int, int);

[Kvencc]

Sure, I'll try it.