Disable tracking of double fields during snapshot creation.

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 c9ef64d0c7c7cd9946fb6b87a38db3f3a23c7490..6e75fdf2cd7eb3704ecf9b6678b9bd9b2b5d79e0 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4052,7 +4052,7 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
       __ SmiTst(value, scratch);
       DeoptimizeIf(eq, instr->environment(), scratch, Operand(zero_reg));
     }
-  } else if (FLAG_track_double_fields && representation.IsDouble()) {
+  } else if (representation.IsDouble()) {
     ASSERT(transition.is_null());
     ASSERT(access.IsInobject());
     ASSERT(!instr->hydrogen()->NeedsWriteBarrier());