Merge pull request #1638 from obscuren/jit-fixes

cmd/evm/main.go

cmd/utils/flags.go

core/block_processor.go

core/vm/instructions.go

core/vm/jit.go

core/vm/jit_test.go

core/vm/settings.go

core/vm/vm.go

tests/state_test.go

tests/state_test_util.go

tests/vm_test.go

tests/vm_test_util.go