[profiler] Don't include tag in CodeEntry hash

maintain hash table invariants (that equality implies matching hashes),
the CodeEntry hash shouldn't include the tag either.

CodeEntry: :IsSameFunctionAs does not consider the CodeEntry's tag, so to
Change-Id: I1e06707b72d49ad9e88368ae68e7ccb16c2483ca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2712786
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72949}

src/profiler/profile-generator.cc

@@ -134,7 +134,7 @@ CodeEntry* CodeEntry::root_entry() {
 }
 
 uint32_t CodeEntry::GetHash() const {
-  uint32_t hash = ComputeUnseededHash(tag());
+  uint32_t hash = 0;
   if (script_id_ != v8::UnboundScript::kNoScriptId) {
     hash ^= ComputeUnseededHash(static_cast<uint32_t>(script_id_));
     hash ^= ComputeUnseededHash(static_cast<uint32_t>(position_));