fix typo
xjit_init -> xjit_new (because xJIT is an opaque structure in the header file)
fix typo
add x64 registers
use xOperand inside address frame ptt
add XJIT_CALL_OPERAND type
enable xjit aliases if only the macro is defined
[WIP] change alias API
add eax
don't use Xbyak::Reg
add `dword` designator
add label support
[WIP] change alias API
enable codegen autogrow