feat(tvix/eval): implement equality operator

Change-Id: I9dd54aed72cd7e67593dc76f5a046ebbda40c26f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6078
Tested-by: BuildkiteCI
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: grfn <grfn@gws.fyi>

tvix/eval/src/compiler.rs

@@ -78,7 +78,7 @@ impl Compiler {
             BinOpKind::Sub => OpCode::OpSub,
             BinOpKind::Mul => OpCode::OpMul,
             BinOpKind::Div => OpCode::OpDiv,
-
+            BinOpKind::Equal => OpCode::OpEqual,
             _ => todo!(),
         };