Crypt Keeper cfb11f352a Adds ability to disable mutable globals and improves decode perf (#315) ...

This adds `RuntimeConfig.WithFeatureMutableGlobal(enabled bool)`, which
allows disabling of mutable globals. When disabled, any attempt to add a
mutable global, either explicitly or implicitly via decoding wasm will
fail.

To support this, there's a new `Features` bitflag that can allow up to
63 feature toggles without passing structs.

While here, I fixed a significant performance problem in decoding
binary:

Before
```
BenchmarkCodecExample/binary.DecodeModule-16         	  184243	      5623 ns/op	    3848 B/op	     184 allocs/op
```

Now
```
BenchmarkCodecExample/binary.DecodeModule-16         	  294084	      3520 ns/op	    2176 B/op	      91 allocs/op

```

Signed-off-by: Adrian Cole <adrian@tetrate.io>

2022-03-03 10:31:10 +08:00

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