core: check if sender is EOA (#23303)

This adds a check to verify that a sender-account does not have code, which means that the codehash is either `emptyCodeHash` _OR_ not present. The latter occurs IFF the sender did not previously exist, a situation which can only occur with zero cost gasprices.

tests/state_test.go

@@ -45,7 +45,8 @@ func TestState(t *testing.T) {
 
 	// Uses 1GB RAM per tested fork
 	st.skipLoad(`^stStaticCall/static_Call1MB`)
-
+	// Un-skip this when https://github.com/ethereum/tests/issues/908 is closed
+	st.skipLoad(`^stQuadraticComplexityTest/QuadraticComplexitySolidity_CallDataCopy`)
 	// Broken tests:
 	// Expected failures:
 	//st.fails(`^stRevertTest/RevertPrecompiledTouch(_storage)?\.json/Byzantium/0`, "bug in test")
@@ -58,7 +59,9 @@ func TestState(t *testing.T) {
 	// For Istanbul, older tests were moved into LegacyTests
 	for _, dir := range []string{
 		stateTestDir,
-		legacyStateTestDir,
+		// legacy state tests are disabled, due to them not being
+		// regenerated for the no-sender-eoa change.
+		//legacyStateTestDir,
 	} {
 		st.walk(t, dir, func(t *testing.T, name string, test *StateTest) {
 			for _, subtest := range test.Subtests() {