Refactor ExternalReference::isolate_address() to not rely on Isolate::Current().

src/mips/deoptimizer-mips.cc

Index: src/mips/deoptimizer-mips.cc
diff --git a/src/mips/deoptimizer-mips.cc b/src/mips/deoptimizer-mips.cc
index 7896f201382e93031008f654402ee1938cf1a636..1784cdc0ecff2c7b2b29a5cd2ff1490c4e3b4ee0 100644
--- a/src/mips/deoptimizer-mips.cc
+++ b/src/mips/deoptimizer-mips.cc
@@ -653,7 +653,7 @@ void Deoptimizer::EntryGenerator::Generate() {
   // a2: bailout id already loaded.
   // a3: code address or 0 already loaded.
   __ sw(t0, CFunctionArgumentOperand(5));  // Fp-to-sp delta.
-  __ li(t1, Operand(ExternalReference::isolate_address()));
+  __ li(t1, Operand(ExternalReference::isolate_address(isolate)));
   __ sw(t1, CFunctionArgumentOperand(6));  // Isolate.
   // Call Deoptimizer::New().
   {