To correctly support instantiating a compiled module multiple times, we clone the
compiled module each time we create an instance, since some of the data is specific
to the instance - e.g. export code, wasm functions, indirect table.

BUG=v8:5072

Review-Url: https://codereview.chromium.org/2134593002
Cr-Commit-Position: refs/heads/master@{#37692}