gasleft extern implemented for WASM runtime (kip-6) (#9357)

* Wasm gasleft extern added

* wasm_gasleft_activation_transition -> kip4_transition

* use kip-6 switch

* gasleft_panic -> gasleft_fail rename

* call_msg_gasleft test added and gas_left agustments because this https://github.com/paritytech/wasm-tests/pull/52

* change .. to _

* fix comment for the have_gasleft param

* update tests (0edbf860ff)

ethcore/vm/src/schedule.rs

@@ -151,6 +151,8 @@ pub struct WasmCosts {
 	pub opcodes_div: u32,
 	/// Whether create2 extern function is activated.
 	pub have_create2: bool,
+	/// Whether gasleft extern function is activated.
+	pub have_gasleft: bool,
 }
 
 impl Default for WasmCosts {
@@ -169,6 +171,7 @@ impl Default for WasmCosts {
 			opcodes_mul: 3,
 			opcodes_div: 8,
 			have_create2: false,
+			have_gasleft: false,
 		}
 	}
 }