MIPS64: Fix port of Refactor Map::ConstructionCount.

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index 7259b1806ee918166794b5cdc36ad8cd29dcfc78..c95ff3078533c95a407006ceb856c10033588830 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -395,9 +395,9 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
         __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
 
         __ Pop(a1, a2);
-        // Slack tracking counter is kNoSlackTracking after runtime call.
-        DCHECK(JSFunction::kNoSlackTracking == 0);
-        __ mov(a6, zero_reg);
+        // Slack tracking counter is Map::kSlackTrackingCounterEnd after runtime
+        // call.
+        __ li(a6, Map::kSlackTrackingCounterEnd);
 
         __ bind(&allocate);
       }