Revert of Provide a tagged allocation top pointer.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index f6358b11901ca3833a33971062f0d50a16866daf..a124a3eba80e53e0cfc899bc43d59a6074327843 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -4423,7 +4423,6 @@
   Label allocate, done_allocate;
   __ ldrb(r4, FieldMemOperand(r2, Map::kInstanceSizeOffset));
   __ Allocate(r4, r0, r5, r6, &allocate, SIZE_IN_WORDS);
-  __ sub(r5, r5, Operand(kHeapObjectTag));  // Untag result end.
   __ bind(&done_allocate);
 
   // Initialize the JSObject fields.
@@ -4564,7 +4563,6 @@
     // Allocate an empty rest parameter array.
     Label allocate, done_allocate;
     __ Allocate(JSArray::kSize, r0, r1, r2, &allocate, NO_ALLOCATION_FLAGS);
-    __ sub(r1, r1, Operand(kHeapObjectTag));  // Untag result end.
     __ bind(&done_allocate);
 
     // Setup the rest parameter array in r0.