The regression comes from attempting to serialize a module with memory
requirements after instantiation - which is what happens in common emscripten
scenarios, where the module is obtained from WebAssembly.instantiate(buffer). We then try and serialize the JSArrayBuffer
representing the instance memory. That operation fails.

Added regression test and also extended the test to cover the other 2
instance-specific values - globals and tables.

Added a discussion on WasmCompiledModule (comments) explaining design decisions.

BUG=chromium:705562

Review-Url: https://codereview.chromium.org/2784453002
Cr-Commit-Position: refs/heads/master@{#44250}