core, core/vm, crypto: fixes for homestead

* Removed some strange code that didn't apply state reverting properly
* Refactored code setting from vm & state transition to the executioner
* Updated tests

core/vm/jump_table_test.go

@@ -0,0 +1,24 @@
+package vm
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/params"
+)
+
+func TestInit(t *testing.T) {
+	params.HomesteadBlock = big.NewInt(1)
+
+	jumpTable.init(big.NewInt(0))
+	if jumpTable[DELEGATECALL].valid {
+		t.Error("Expected DELEGATECALL not to be present")
+	}
+
+	for _, n := range []int64{1, 2, 100} {
+		jumpTable.init(big.NewInt(n))
+		if !jumpTable[DELEGATECALL].valid {
+			t.Error("Expected DELEGATECALL to be present for block", n)
+		}
+	}
+}