revert previous changes

Author: chriselrod

src/modeling/graphs.jl

@@ -1157,7 +1157,7 @@ function prepare_rhs_for_storage!(ls::LoopSet, RHS::Union{Symbol,Expr}, array, r
   ref = mpref.mref.ref
   lrhs = gensym!(ls, "RHS")
   mpref.varname = lrhs
-  ls.opdict[lrhs] = add_operation!(ls, lrhs, RHS, mpref, elementbytes, position)
+  add_operation!(ls, lrhs, RHS, mpref, elementbytes, position)
   mpref.parents = cachedparents
   op = add_store!(ls, mpref, elementbytes)
   ls.syms_aliasing_refs[findfirst(==(mpref.mref), ls.refs_aliasing_syms)] = lrhs

src/parse/add_loads.jl

@@ -14,7 +14,7 @@ end
 function add_load!(ls::LoopSet, op::Operation, actualarray::Bool = true)
   @assert isload(op)
   if (id = maybeaddref!(ls, op)) > 0 # try to CSE
-    opp = ls.opdict[ls.syms_aliasing_refs[id]] # throw an error if not found.
+    opp = ls.opdict[ls.syms_aliasing_refs[id]]
     op_inds = getindicesonly(op)
     li = op.ref.loopedindex
     allmatch = true