420850adf0
The result of the emitter is a vector of bytes holding machine code, jump tables, and (in the future) other read-only data. Some clients, notably Firefox's Wasm compiler, needs to separate the machine code from the data in order to insert more code directly after the code generated by Cranelift. To make such separation possible, we record more information about the emitted bytes: the sizes of each of the sections of code, jump tables, and read-only data, as well as the locations within the code that reference (PC-relatively) the jump tables and read-only data.