MIPS: Use signaling NaN for holes in fixed double arrays.

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
diff --git a/src/mips/codegen-mips.cc b/src/mips/codegen-mips.cc
index fbd40443168187157c128fd17c5f92be12d08b1a..0e28eed8001a524469d08a9c8dd2aa93eed7dabb 100644
--- a/src/mips/codegen-mips.cc
+++ b/src/mips/codegen-mips.cc
@@ -771,15 +771,16 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   // Repurpose registers no longer in use.
   Register hole_lower = elements;
   Register hole_upper = length;
-
   __ li(hole_lower, Operand(kHoleNanLower32));
+  __ li(hole_upper, Operand(kHoleNanUpper32));
+
   // scratch1: begin of source FixedArray element fields, not tagged
   // hole_lower: kHoleNanLower32
   // hole_upper: kHoleNanUpper32
   // array_end: end of destination FixedDoubleArray, not tagged
   // scratch3: begin of FixedDoubleArray element fields, not tagged
-  __ Branch(USE_DELAY_SLOT, &entry);
-  __ li(hole_upper, Operand(kHoleNanUpper32));  // In delay slot.
+
+  __ Branch(&entry);
 
   __ bind(&only_change_map);
   __ sw(target_map, FieldMemOperand(receiver, HeapObject::kMapOffset));