[turbofan] Don't merge PropertyAccessInfos with different field maps.

src/compiler/access-info.cc

Index: src/compiler/access-info.cc
diff --git a/src/compiler/access-info.cc b/src/compiler/access-info.cc
index 35f7bbc8f4adb1326baca99df40f9e0230891574..f23154aa45aa53674d53f7fb13048347a1adf5ce 100644
--- a/src/compiler/access-info.cc
+++ b/src/compiler/access-info.cc
@@ -150,6 +150,7 @@ bool PropertyAccessInfo::Merge(PropertyAccessInfo const* that) {
       // Check if we actually access the same field.
       if (this->transition_map_.address() == that->transition_map_.address() &&
           this->field_index_ == that->field_index_ &&
+          this->field_map_.address() == that->field_map_.address() &&
           this->field_type_->Is(that->field_type_) &&
           that->field_type_->Is(this->field_type_) &&
           this->field_representation_ == that->field_representation_) {