Merge pull request #6251 from ethereum-optimism/clabby/ctb/mips-step-rename

chore(ctb): Rename MIPS step function

cannon/mipsevm/evm.go

@@ -24,7 +24,7 @@ import (
 )
 
 var (
-	StepBytes4                      = crypto.Keccak256([]byte("Step(bytes,bytes)"))[:4]
+	StepBytes4                      = crypto.Keccak256([]byte("step(bytes,bytes)"))[:4]
 	CheatBytes4                     = crypto.Keccak256([]byte("cheat(uint256,bytes32,bytes32,uint256)"))[:4]
 	LoadKeccak256PreimagePartBytes4 = crypto.Keccak256([]byte("loadKeccak256PreimagePart(uint256,bytes)"))[:4]
 )

packages/contracts-bedrock/contracts/cannon/MIPS.sol

@@ -379,7 +379,7 @@ contract MIPS {
   }
 
   // will revert if any required input state is missing
-  function Step(bytes calldata stateData, bytes calldata proof) public returns (bytes32) {
+  function step(bytes calldata stateData, bytes calldata proof) public returns (bytes32) {
     State memory state;
     // packed data is ~6 times smaller
     assembly {