3f3a9bf7f5
This defers the call to `llvm_cov::write_function_mappings_to_buffer` until just before its enclosing global variable is created.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.