Revert of [turbofan] Extend escape analysis to reduce certain CheckMaps....

Revert of [turbofan] Extend escape analysis to reduce certain CheckMaps. (patchset #1 id:1 of https://codereview.chromium.org/2964473002/ )

Reason for revert:
Speculative revert for tiny fire on Canary (crbug.com/738781)

Original issue's description:
> [turbofan] Extend escape analysis to reduce certain CheckMaps.
>
> Enable the experimental support in escape analysis to deal with
> constant-foldable CheckMaps nodes and remove them from the effect
> chain w/o blocking the scalar replacement of the object.
>
> BUG=v8:4586,v8:5267
> R=tebbi@chromium.org
>
> Review-Url: https://codereview.chromium.org/2964473002
> Cr-Commit-Position: refs/heads/master@{#46311}
> Committed: https://chromium.googlesource.com/v8/v8/+/adf7f54e24c4b31207b4df0e30c28f7579b18f5c

TBR=tebbi@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=v8:4586,v8:5267

Review-Url: https://codereview.chromium.org/2970663002
Cr-Commit-Position: refs/heads/master@{#46372}

src/compiler/escape-analysis.cc

@@ -1517,6 +1517,7 @@ void EscapeAnalysis::ProcessCheckMaps(Node* node) {
   DCHECK_EQ(node->opcode(), IrOpcode::kCheckMaps);
   ForwardVirtualState(node);
   Node* checked = ResolveReplacement(NodeProperties::GetValueInput(node, 0));
+  if (FLAG_turbo_experimental) {
     VirtualState* state = virtual_states_[node->id()];
     if (VirtualObject* object = GetVirtualObject(state, checked)) {
       if (!object->IsTracked()) {
@@ -1539,11 +1540,13 @@ void EscapeAnalysis::ProcessCheckMaps(Node* node) {
         if (value->opcode() == IrOpcode::kHeapConstant &&
             params.maps().contains(ZoneHandleSet<Map>(
                 Handle<Map>::cast(OpParameter<Handle<HeapObject>>(value))))) {
-        TRACE("CheckMaps #%i seems to be redundant (until now).\n", node->id());
+          TRACE("CheckMaps #%i seems to be redundant (until now).\n",
+                node->id());
           return;
         }
       }
     }
+  }
   if (status_analysis_->SetEscaped(node)) {
     TRACE("Setting #%d (%s) to escaped (checking #%i)\n", node->id(),
           node->op()->mnemonic(), checked->id());