[turbofan] Fix deopt loop due to forgetting maps on Merge.

When we merge two NotFound access infos, we currently forgot to include
all the maps into the final PropertyAccessInfo, which results in a deopt
loop.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2625413003
Cr-Commit-Position: refs/heads/master@{#42332}

src/compiler/access-info.cc

@@ -146,9 +146,6 @@ bool PropertyAccessInfo::Merge(PropertyAccessInfo const* that) {
     case kInvalid:
       break;
 
-    case kNotFound:
-      return true;
-
     case kDataField: {
       // Check if we actually access the same field.
       if (this->transition_map_.address() == that->transition_map_.address() &&
@@ -175,6 +172,8 @@ bool PropertyAccessInfo::Merge(PropertyAccessInfo const* that) {
       }
       return false;
     }
+
+    case kNotFound:
     case kGeneric: {
       this->receiver_maps_.insert(this->receiver_maps_.end(),
                                   that->receiver_maps_.begin(),