feat(tvix/eval): track source spans for function calls

Change-Id: If1bb463026414597acd561dc2032549fdb70f986
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6397
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

tvix/eval/src/compiler/mod.rs

@@ -911,7 +911,7 @@ impl Compiler<'_> {
         // to enter the function call straight away.
         self.compile(slot, node.argument().unwrap());
         self.compile(slot, node.lambda().unwrap());
-        self.push_op_old(OpCode::OpCall);
+        self.push_op(OpCode::OpCall, &node);
     }
 
     /// Compile an expression into a runtime thunk which should be