X87: Get rid of AllocationFlags::TAG_OBJECT.

  port ef49c6b1 (r35792)

  original commit message:
  Default (and only way) is now to retrieve a tagged object.

BUG=

Review URL: https://codereview.chromium.org/1924643004

Cr-Commit-Position: refs/heads/master@{#35808}

src/x87/codegen-x87.cc

@@ -275,9 +275,9 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   // Allocate new FixedDoubleArray.
   // edx: receiver
   // edi: length of source FixedArray (smi-tagged)
+  AllocationFlags flags = static_cast<AllocationFlags>(DOUBLE_ALIGNMENT);
   __ Allocate(FixedDoubleArray::kHeaderSize, times_8, edi,
-              REGISTER_VALUE_IS_SMI, eax, ebx, no_reg, &gc_required,
-              DOUBLE_ALIGNMENT);
+              REGISTER_VALUE_IS_SMI, eax, ebx, no_reg, &gc_required, flags);
 
   // eax: destination FixedDoubleArray
   // edi: number of elements

src/x87/macro-assembler-x87.cc

@@ -1520,10 +1520,10 @@ void MacroAssembler::Allocate(int object_size,
   // Update allocation top.
   UpdateAllocationTopHelper(top_reg, scratch, flags);
 
-  // Tag result if requested.
   if (top_reg.is(result)) {
     sub(result, Immediate(object_size - kHeapObjectTag));
   } else {
+    // Tag the result.
     DCHECK(kHeapObjectTag == 1);
     inc(result);
   }
@@ -1597,6 +1597,7 @@ void MacroAssembler::Allocate(int header_size,
   cmp(result_end, Operand::StaticVariable(allocation_limit));
   j(above, gc_required);
 
+  // Tag result.
   DCHECK(kHeapObjectTag == 1);
   inc(result);