Cache WeakCell for optimized code.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 7711cc725a97d269a0ad56bf39b1950fe4deb2f0..c22243d9588fbb6d836dfb47a8842e2d9852ecfb 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -908,6 +908,7 @@ void LCodeGen::PopulateDeoptimizationData(Handle<Code> code) {
   } else {
     data->SetSharedFunctionInfo(Smi::FromInt(0));
   }
+  data->SetWeakCellCache(Smi::FromInt(0));
 
   Handle<FixedArray> literals =
       factory()->NewFixedArray(deoptimization_literals_.length(), TENURED);