Fix: hardcoded JIT code buffer size (#98)

* code buffer size is calculated based on RandomX parameters
* added a maximum value constraint for program size and superscalar latency
* reduced the x86 code size of memory instructions by 1 byte
* disclaimer note in configuration documentation

src/virtual_memory.hpp

@@ -30,6 +30,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <cstddef>
 
+constexpr std::size_t alignSize(std::size_t pos, std::size_t align) {
+	return ((pos - 1) / align + 1) * align;
+}
+
 void* allocExecutableMemory(std::size_t);
 void* allocLargePagesMemory(std::size_t);
 void freePagedMemory(void*, std::size_t);