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

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 72091c3e4d371e6258e83317f2177b306c25cab3..e5924ef1050c0bbd8c3a1d1ce6aab92121d1911a 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3885,7 +3885,7 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
   SmiCheck check_needed = hinstr->value()->IsHeapObject()
                           ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
 
-  if (FLAG_track_fields && representation.IsSmi()) {
+  if (representation.IsSmi()) {
     if (instr->value()->IsConstantOperand()) {
       LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
       if (!IsInteger32Constant(operand_value) &&
@@ -3893,7 +3893,7 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
         DeoptimizeIf(no_condition, instr->environment());
       }
     }
-  } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
+  } else if (representation.IsHeapObject()) {
     if (instr->value()->IsConstantOperand()) {
       LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
       if (IsInteger32Constant(operand_value)) {