Simplify a DCHECK.

R=sigurds@chromium.org

Change-Id: I409848080991b8fbf12b217cd648247940ee521d
Reviewed-on: https://chromium-review.googlesource.com/c/1417850Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58907}

src/runtime/runtime-scopes.cc

@@ -149,7 +149,7 @@ Object DeclareGlobals(Isolate* isolate, Handle<FixedArray> declarations,
 
     bool is_var = initial_value->IsUndefined(isolate);
     bool is_function = initial_value->IsSharedFunctionInfo();
-    DCHECK_EQ(1, BoolToInt(is_var) + BoolToInt(is_function));
+    DCHECK_NE(is_var, is_function);
 
     Handle<Object> value;
     if (is_function) {