MIPS: 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 0f83a613c162fb93c71d0dee56b2dcbd051a6dd6..ee528dd86930b600807bd998395b5c8444539b9b 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -1468,6 +1468,13 @@ 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 cell payload. Calculate the start of the object.
+    __ Dsubu(scratch, 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.