[dart2wasm] Add non-es6 module loading option to mjs runtime file.
In environments that don't support dynamic import of JS modules (i.e.
`import('path/to/main.mjs')`) our current MJS file layout doesn't work.
The `export` keyword is explicitly disallowed unless the JS code is
designated a module.
This sets up an alternative method of reaching the `compile` and
`compileStreaming` functions within the mjs file. One can pass a context
object to the IIFE and both functions will be assigned to this object.
If there are multiple apps on a page, then different context objects can
be passed.
As of right now, "compile" and "compileStreaming" are the only exported
members from the module.
This requires some post-processing of the MJS file but should be as
simple as appending a small code snippet to use it.
Change-Id: I965518a39a2b78f5d0c28a498084ad7fa0a21ceb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/533021
Commit-Queue: Nate Biggs <natebiggs@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
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