MIPS: Avoid embedding x86 NaN constant in code when snapshot is created.

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 a2df23fc5a88bcd6278f2a46a3b70fc3944bb6bd..b216a7d02a8ea3834c70d9d8d7042d6fb90c030e 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4222,8 +4222,8 @@ void LCodeGen::DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr) {
 
     // Only load canonical NaN if the comparison above set the overflow.
     __ bind(&is_nan);
-    __ Move(double_scratch,
-            FixedDoubleArray::canonical_not_the_hole_nan_as_double());
+    __ LoadRoot(at, Heap::kNanValueRootIndex);
+    __ ldc1(double_scratch, FieldMemOperand(at, HeapNumber::kValueOffset));
     __ sdc1(double_scratch, MemOperand(scratch, instr->additional_index() <<
         element_size_shift));
     __ Branch(&done);