Rename variable master to implementation

(cherry picked from commit cdb929aa)

contracts/proxy/Clones.sol

@@ -17,16 +17,16 @@ pragma solidity ^0.8.0;
  */
 library Clones {
     /**
-     * @dev Deploys and returns the address of a clone that mimics the behaviour of `master`.
+     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
      *
      * This function uses the create opcode, which should never revert.
      */
-    function clone(address master) internal returns (address instance) {
+    function clone(address implementation) internal returns (address instance) {
         // solhint-disable-next-line no-inline-assembly
         assembly {
             let ptr := mload(0x40)
             mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
-            mstore(add(ptr, 0x14), shl(0x60, master))
+            mstore(add(ptr, 0x14), shl(0x60, implementation))
             mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
             instance := create(0, ptr, 0x37)
         }
@@ -34,18 +34,18 @@ library Clones {
     }
 
     /**
-     * @dev Deploys and returns the address of a clone that mimics the behaviour of `master`.
+     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
      *
      * This function uses the create2 opcode and a `salt` to deterministically deploy
-     * the clone. Using the same `master` and `salt` multiple time will revert, since
+     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
      * the clones cannot be deployed twice at the same address.
      */
-    function cloneDeterministic(address master, bytes32 salt) internal returns (address instance) {
+    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
         // solhint-disable-next-line no-inline-assembly
         assembly {
             let ptr := mload(0x40)
             mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
-            mstore(add(ptr, 0x14), shl(0x60, master))
+            mstore(add(ptr, 0x14), shl(0x60, implementation))
             mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
             instance := create2(0, ptr, 0x37, salt)
         }
@@ -55,12 +55,12 @@ library Clones {
     /**
      * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
      */
-    function predictDeterministicAddress(address master, bytes32 salt, address deployer) internal pure returns (address predicted) {
+    function predictDeterministicAddress(address implementation, bytes32 salt, address deployer) internal pure returns (address predicted) {
         // solhint-disable-next-line no-inline-assembly
         assembly {
             let ptr := mload(0x40)
             mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
-            mstore(add(ptr, 0x14), shl(0x60, master))
+            mstore(add(ptr, 0x14), shl(0x60, implementation))
             mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
             mstore(add(ptr, 0x38), shl(0x60, deployer))
             mstore(add(ptr, 0x4c), salt)
@@ -72,7 +72,7 @@ library Clones {
     /**
      * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
      */
-    function predictDeterministicAddress(address master, bytes32 salt) internal view returns (address predicted) {
-        return predictDeterministicAddress(master, salt, address(this));
+    function predictDeterministicAddress(address implementation, bytes32 salt) internal view returns (address predicted) {
+        return predictDeterministicAddress(implementation, salt, address(this));
     }
 }