At the moment a WebAssembly module can be serialized successfully when
all functions were compiled with TurboFan. However, for some functions
it may not be necessary to be compiled with TurboFan, e.g. for functions
where Liftoff code is as good as TurboFan code.

With this CL we allow WebAssembly modules to get serialized even when
not all functions are compiled with TurboFan. Missing functions are
marked as missing in the serlialization. Upon deserialization, missing
functions either get compiled by Liftoff, or initialized with a
lazy-compilation stub, depending on the V8 configuration.

Bug: v8:11862
Change-Id: Ic833a17639bf841c5def6fe3c35173fe0376c246
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960209
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75987}