Remove all uses of field-tracking flags that do not make decisions but are subject to existing info…

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index f7a3554f7ae8350418f3cbf4c3849d254d0a455f..cd117efce2cc8f5222c283b77caf618db9d362e3 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5826,9 +5826,8 @@ class HObjectAccess V8_FINAL {
     return HObjectAccess(
         kArrayLengths,
         JSArray::kLengthOffset,
-        IsFastElementsKind(elements_kind) &&
-            FLAG_track_fields
-                ? Representation::Smi() : Representation::Tagged());
+        IsFastElementsKind(elements_kind)
+            ? Representation::Smi() : Representation::Tagged());
   }
 
   static HObjectAccess ForAllocationSiteOffset(int offset);
@@ -5842,7 +5841,7 @@ class HObjectAccess V8_FINAL {
     return HObjectAccess(
         kArrayLengths,
         FixedArray::kLengthOffset,
-        FLAG_track_fields ? Representation::Smi() : Representation::Tagged());
+        Representation::Smi());
   }
 
   static HObjectAccess ForStringHashField() {
@@ -5856,7 +5855,7 @@ class HObjectAccess V8_FINAL {
     return HObjectAccess(
         kStringLengths,
         String::kLengthOffset,
-        FLAG_track_fields ? Representation::Smi() : Representation::Tagged());
+        Representation::Smi());
   }
 
   static HObjectAccess ForConsStringFirst() {
@@ -6147,8 +6146,7 @@ class HLoadNamedField V8_FINAL : public HTemplateInstruction<2> {
                representation.IsExternal() ||
                representation.IsInteger32()) {
       set_representation(representation);
-    } else if (FLAG_track_heap_object_fields &&
-               representation.IsHeapObject()) {
+    } else if (representation.IsHeapObject()) {
       set_type(HType::NonPrimitive());
       set_representation(Representation::Tagged());
     } else {
@@ -6546,8 +6544,7 @@ class HStoreNamedField V8_FINAL : public HTemplateInstruction<3> {
   }
 
   bool NeedsWriteBarrier() {
-    ASSERT(!(FLAG_track_double_fields && field_representation().IsDouble()) ||
-           !has_transition());
+    ASSERT(!field_representation().IsDouble() || !has_transition());
     if (IsSkipWriteBarrier()) return false;
     if (field_representation().IsDouble()) return false;
     if (field_representation().IsSmi()) return false;