Fix some ffi info and compile error for LoongArch

Jinyang Herequested to merge
MQ-mengqing/source:some_fix into main

1, Fix the ffi_cif members for LoongArch.

See https://github.com/libffi/libffi/blob/master/src/loongarch64/ffitarget.h#L78

2, Fix the GetCodeAddress get result from fCode.

We set fData by fData := ffi_closure_alloc(SizeOf(ffi_closure), @fCode);, the real codeaddress should be set to fCode.

3, As LoongArch has no copy relocation, we should emit la.got for global symbol whether pic or nopic.

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