Track regmove instruction during binemit.

Register locations can change throughout an EBB. Make sure the
emit_inst() function considers this when encoding instructions and
update the register diversion tracker.

lib/cretonne/src/isa/riscv/binemit.rs

@@ -4,6 +4,7 @@ use binemit::{CodeSink, Reloc, bad_encoding};
 use ir::{Function, Inst, InstructionData};
 use isa::RegUnit;
 use predicates::is_signed_int;
+use regalloc::RegDiversions;
 
 include!(concat!(env!("OUT_DIR"), "/binemit-riscv.rs"));