4cca436e30
In #91608 the fp-armv8 feature was removed as it's tied to the neon feature. However disabling neon didn't actually disable the use of floating point registers and instructions, for this `-fp-armv8` is required.
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.