Extract common modifier parameters into ModifierEvalContext struct

The contents of the ModifierEvalContext struct are constant while iterating
over the modifier stack. The struct thus should be only created once, outside
any loop over the modifiers.

source/blender/modifiers/intern/MOD_edgesplit.c

@@ -121,9 +121,8 @@ static void copyData(ModifierData *md, ModifierData *target)
 	modifier_copyData_generic(md, target);
 }
 
-static DerivedMesh *applyModifier(ModifierData *md, struct Depsgraph *UNUSED(depsgraph),
-                                  Object *UNUSED(ob), DerivedMesh *dm,
-                                  ModifierApplyFlag UNUSED(flag))
+static DerivedMesh *applyModifier(ModifierData *md, const ModifierEvalContext *UNUSED(ctx),
+                                  DerivedMesh *dm)
 {
 	DerivedMesh *result;
 	EdgeSplitModifierData *emd = (EdgeSplitModifierData *) md;