This simplifies profiling since now we can see the results within a single build
based on the preference (though there is still a slight cost to copying the
bytecode).
Setting to (the default) 0 disables compression.
Differential Revision: https://phabricator.services.mozilla.com/D144737
This leaves the code in ScriptLoader and ScriptLoadHandler a lot more readable.
ScriptBytecodeCompressedDataLayout and ScriptBytecodeDataLayout simplify
locating data in the ScriptLoadRequest bytecode buffer when compressing and
decompressing it.
The interface is still error-prone. For example, these classes don't check
that the returned pointers are within the bounds of the buffer.
Differential Revision: https://phabricator.services.mozilla.com/D145011
Bryan Thrall