[build] avoid DCHECK in constexpr function

... to fix GCC compile failures.

Change-Id: I836fb6883354b26aa33085d9a96c5d957af5c5bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2537707Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71209}

src/objects/contexts.h

@@ -460,7 +460,7 @@ class Context : public TorqueGeneratedContext<Context, HeapObject> {
   V8_INLINE static constexpr int SizeFor(int length) {
     // TODO(v8:9287): This is a workaround for GCMole build failures.
     int result = kElementsOffset + length * kTaggedSize;
-    DCHECK_EQ(TorqueGeneratedContext::SizeFor(length), result);
+    CONSTEXPR_DCHECK(TorqueGeneratedContext::SizeFor(length) == result);
     return result;
   }