Implement KIP4: create2 for wasm (#9277)

* Basic implementation for kip4

* Add KIP-4 config flags

* typo: docs fix

* Fix args offset

* Add tests for create2

* tests: evm

* Update wasm-tests and fix all gas costs

* Update wasm-tests

* Update wasm-tests and fix gas costs

ethcore/src/spec/spec.rs

@@ -125,6 +125,8 @@ pub struct CommonParams {
 	pub remove_dust_contracts: bool,
 	/// Wasm activation blocknumber, if any disabled initially.
 	pub wasm_activation_transition: BlockNumber,
+	/// Number of first block where KIP-4 rules begin. Only has effect if Wasm is activated.
+	pub kip4_transition: BlockNumber,
 	/// Gas limit bound divisor (how much gas limit can change per block)
 	pub gas_limit_bound_divisor: U256,
 	/// Registrar contract address.
@@ -187,7 +189,11 @@ impl CommonParams {
 			};
 		}
 		if block_number >= self.wasm_activation_transition {
-			schedule.wasm = Some(Default::default());
+			let mut wasm = ::vm::WasmCosts::default();
+			if block_number >= self.kip4_transition {
+				wasm.have_create2 = true;
+			}
+			schedule.wasm = Some(wasm);
 		}
 	}
 
@@ -294,6 +300,10 @@ impl From<ethjson::spec::Params> for CommonParams {
 				BlockNumber::max_value,
 				Into::into
 			),
+			kip4_transition: p.kip4_transition.map_or_else(
+				BlockNumber::max_value,
+				Into::into
+			),
 		}
 	}
 }