[Heap] Fix comparing against new space top pointer

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 332ac4c6f2e861c52f41595a218a6e9a93d72c2d..a58084cfbef4f76a98e8ce55691b7ba81ba77175 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -6609,7 +6609,7 @@ void MacroAssembler::TestJSArrayForAllocationMemento(Register receiver_reg,
                                                      Label* no_memento_found) {
   Label map_check;
   Label top_check;
-  ExternalReference new_space_allocation_top =
+  ExternalReference new_space_allocation_top_adr =
       ExternalReference::new_space_allocation_top_address(isolate());
   const int kMementoMapOffset = JSArray::kSize - kHeapObjectTag;
   const int kMementoEndOffset = kMementoMapOffset + AllocationMemento::kSize;
@@ -6619,7 +6619,9 @@ void MacroAssembler::TestJSArrayForAllocationMemento(Register receiver_reg,
   // If the object is in new space, we need to check whether it is on the same
   // page as the current top.
   Addu(scratch_reg, receiver_reg, Operand(kMementoEndOffset));
-  Xor(scratch_reg, scratch_reg, Operand(new_space_allocation_top));
+  li(at, Operand(new_space_allocation_top_adr));
+  lw(at, MemOperand(at));
+  Xor(scratch_reg, scratch_reg, Operand(at));
   And(scratch_reg, scratch_reg, Operand(~Page::kPageAlignmentMask));
   Branch(&top_check, eq, scratch_reg, Operand(zero_reg));
   // The object is on a different page than allocation top. Bail out if the
@@ -6635,7 +6637,7 @@ void MacroAssembler::TestJSArrayForAllocationMemento(Register receiver_reg,
   // we are below top.
   bind(&top_check);
   Addu(scratch_reg, receiver_reg, Operand(kMementoEndOffset));
-  li(at, Operand(new_space_allocation_top));
+  li(at, Operand(new_space_allocation_top_adr));
   lw(at, MemOperand(at));
   Branch(no_memento_found, gt, scratch_reg, Operand(at));
   // Memento map check.