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

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 60791801279490f68e9613af74b196b10b67a34d..b43fb56084f67b8b79e670eead73fe01b677214d 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -3917,7 +3917,7 @@ void MacroAssembler::StoreNumberToDoubleElements(Register value_reg,
 
   // Check for nan: all NaN values have a value greater (signed) than 0x7ff00000
   // in the exponent.
-  li(scratch1, Operand(kNaNOrInfinityLowerBoundUpper32));
+  li(scratch1, Operand(kHoleNanUpper32 & HeapNumber::kExponentMask));
   lw(exponent_reg, FieldMemOperand(value_reg, HeapNumber::kExponentOffset));
   Branch(&maybe_nan, ge, exponent_reg, Operand(scratch1));