use identity for const

Author: KDr2

src/tapedfunction.jl

@@ -273,11 +273,13 @@ end
 const IRVar = Union{Core.SSAValue, Core.SlotNumber}
 
 function _const_instruction(var::IRVar, v, bindings::Dict{Symbol, Any}, ir)
+    #=
     if isa(var, Core.SSAValue)
         box = bind_var!(var, bindings, ir)
         bindings[box.id] = v
         return GotoInstruction(Box{Bool}(:_true), 0) # NOOP
     end
+    =#
     return Instruction(identity, (bind_var!(v, bindings, ir),), bind_var!(var, bindings, ir))
 end