Revert "sizeExpr: fix a bug in the size calculation"

This reverts commit 51a33924.

compiler/coreSyn/CoreUnfold.hs

@@ -578,18 +578,13 @@ sizeExpr dflags bOMB_OUT_SIZE top_args expr
                                            size_up_app fun (arg:args) voids
     size_up_app (Var fun)     args voids = size_up_call fun args voids
     size_up_app (Tick _ expr) args voids = size_up_app expr args voids
-    size_up_app (Cast expr _) args voids = size_up_app expr args voids
-    size_up_app other         args voids = size_up other `addSizeN`
-                                           callSize (length args) voids
-       -- if the lhs is not an App or a Var, or an invisible thing like a
-       -- Tick or Cast, then we should charge for a complete call plus the
-       -- size of the lhs itself.
+    size_up_app other         args voids = size_up other `addSizeN` (length args - voids)
 
     ------------
     size_up_call :: Id -> [CoreExpr] -> Int -> ExprSize
     size_up_call fun val_args voids
        = case idDetails fun of
-           FCallId _        -> sizeN (callSize (length val_args) voids)
+           FCallId _        -> sizeN (10 * (1 + length val_args))
            DataConWorkId dc -> conSize    dc (length val_args)
            PrimOpId op      -> primOpSize op (length val_args)
            ClassOpId _      -> classOpSize dflags top_args val_args
@@ -662,13 +657,6 @@ classOpSize dflags top_args (arg1 : other_args)
                               -> unitBag (dict, ufDictDiscount dflags)
                      _other   -> emptyBag
 
--- | The size of a function call
-callSize
- :: Int  -- ^ number of value args
- -> Int  -- ^ number of value args that are void
- -> Int
-callSize n_val_args voids = 10 * (1 + n_val_args - voids)
-
 funSize :: DynFlags -> [Id] -> Id -> Int -> Int -> ExprSize
 -- Size for functions that are not constructors or primops
 -- Note [Function applications]
@@ -679,7 +667,7 @@ funSize dflags top_args fun n_val_args voids
   where
     some_val_args = n_val_args > 0
 
-    size | some_val_args = callSize n_val_args voids
+    size | some_val_args = 10 * (1 + n_val_args - voids)
          | otherwise     = 0
         -- The 1+ is for the function itself
         -- Add 1 for each non-trivial arg;