core/vm, tests: implemented semi-jit vm

* changed stack and removed stack ptr. Let go decide on slice reuse.

tests/vm_test.go

@@ -21,6 +21,20 @@ import (
 	"testing"
 )
 
+func BenchmarkVmAckermann32Tests(b *testing.B) {
+	fn := filepath.Join(vmTestDir, "vmPerformanceTest.json")
+	if err := BenchVmTest(fn, bconf{"ackermann32", true, false}, b); err != nil {
+		b.Error(err)
+	}
+}
+
+func BenchmarkVmFibonacci16Tests(b *testing.B) {
+	fn := filepath.Join(vmTestDir, "vmPerformanceTest.json")
+	if err := BenchVmTest(fn, bconf{"fibonacci16", true, true}, b); err != nil {
+		b.Error(err)
+	}
+}
+
 // I've created a new function for each tests so it's easier to identify where the problem lies if any of them fail.
 func TestVMArithmetic(t *testing.T) {
 	fn := filepath.Join(vmTestDir, "vmArithmeticTest.json")