Reland "Merge cellspace into old pointer space"

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 68dc804dce5229c7a9f3913bb0a5eb4bab3e9780..11234e1891b62a1e598e768ad3ea036d4c0e7726 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -1459,6 +1459,14 @@ void InstanceofStub::Generate(MacroAssembler* masm) {
     // Get the map location in scratch and patch it.
     __ GetRelocatedValue(inline_site, scratch, v1);  // v1 used as scratch.
     __ sd(map, FieldMemOperand(scratch, Cell::kValueOffset));
+
+    __ mov(t0, map);
+    // |scratch| points at the beginning of the cell. Calculate the
+    // field containing the map.
+    __ Daddu(function, scratch, Operand(Cell::kValueOffset - 1));
+    __ RecordWriteField(scratch, Cell::kValueOffset, t0, function,
+                        kRAHasNotBeenSaved, kDontSaveFPRegs,
+                        OMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
   }
 
   // Register mapping: a3 is object map and a4 is function prototype.