Merge pull request #9658 from pennae/env-diet

reduce the size of Env by one pointer

(cherry picked from commit 83f5622545a2fc31eb7e7d5105f64ed6dd3058b3)
Change-Id: I5636290526d0165cfc61aee1e7a5b94db4a26cef

src/libexpr/eval-inline.hh

@@ -73,8 +73,6 @@ Env & EvalState::allocEnv(size_t size)
 #endif
         env = (Env *) allocBytes(sizeof(Env) + size * sizeof(Value *));
 
-    env->type = Env::Plain;
-
     /* We assume that env->values has been cleared by the allocator; maybeThunk() and lookupVar fromWith expect this. */
 
     return *env;