UniswapV2Router01 and 02: replace "if (A && B)" to save gas fees

[BurtonQin]

The solidity compiler generates more code for “if (A && B) {}” than for “if (A) {if (B) {} }”.
Our experiment shows that switching from “if (A && B) {}” to “if (A) {if (B) {} }” can save gas fees.

There are two such cases:

v2-periphery/contracts/UniswapV2Router01.sol

Line 43 in 0335e8f

if (reserveA == 0 && reserveB == 0) {

v2-periphery/contracts/UniswapV2Router02.sol

Line 46 in 0335e8f

if (reserveA == 0 && reserveB == 0) {

Replacing

if (reserveA == 0 && reserveB == 0) {

with

if (reserveA == 0) {
    if (reserveB == 0) {

can save gas fees and does not hurt code readability.

[Divy027]

can I help to solve this issues?