`ERC2771Context` gas improvements (#5590)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

contracts/metatx/ERC2771Context.sol

@@ -55,8 +55,10 @@ abstract contract ERC2771Context is Context {
     function _msgSender() internal view virtual override returns (address) {
         uint256 calldataLength = msg.data.length;
         uint256 contextSuffixLength = _contextSuffixLength();
-        if (isTrustedForwarder(msg.sender) && calldataLength >= contextSuffixLength) {
-            return address(bytes20(msg.data[calldataLength - contextSuffixLength:]));
+        if (calldataLength >= contextSuffixLength && isTrustedForwarder(msg.sender)) {
+            unchecked {
+                return address(bytes20(msg.data[calldataLength - contextSuffixLength:]));
+            }
         } else {
             return super._msgSender();
         }
@@ -70,8 +72,10 @@ abstract contract ERC2771Context is Context {
     function _msgData() internal view virtual override returns (bytes calldata) {
         uint256 calldataLength = msg.data.length;
         uint256 contextSuffixLength = _contextSuffixLength();
-        if (isTrustedForwarder(msg.sender) && calldataLength >= contextSuffixLength) {
-            return msg.data[:calldataLength - contextSuffixLength];
+        if (calldataLength >= contextSuffixLength && isTrustedForwarder(msg.sender)) {
+            unchecked {
+                return msg.data[:calldataLength - contextSuffixLength];
+            }
         } else {
             return super._msgData();
         }