safe_ops: Avoid signed overflow in Negate()

Negation of values such as -9223372036854775808 can't be represented in
signed equivalents (such as long long), leading to signed overflow.
Therefore, we can just invert bits and add 1 to perform this behavior
with unsigned arithmetic.

src/common/safe_ops.h

@@ -103,7 +103,7 @@ T ArithmeticShiftRightDouble(T top, T bottom, int shift_amount) {
 
 template<typename T>
 T Negate(T value) {
-    return static_cast<T>(-static_cast<std::make_signed_t<T>>(value));
+    return static_cast<T>(~static_cast<std::uintmax_t>(value) + 1);
 }
 
 } // namespace Dynarmic::Safe