MIPS: Fix the cctest QuietSignalingNaNs for MIPS.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index b394e950dd45421f4851e14d8dee926032db1df3..2feb5edafc07a1b9eeac457746e0b648b603450f 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -13564,7 +13564,13 @@ THREADED_TEST(QuietSignalingNaNs) {
     } else {
       uint64_t stored_bits = DoubleToBits(stored_number);
       // Check if quiet nan (bits 51..62 all set).
+#if defined(V8_TARGET_ARCH_MIPS) && !defined(USE_SIMULATOR)
+      // Most significant fraction bit for quiet nan is set to 0
+      // on MIPS architecture. Allowed by IEEE-754.
+      CHECK_EQ(0xffe, static_cast<int>((stored_bits >> 51) & 0xfff));
+#else
       CHECK_EQ(0xfff, static_cast<int>((stored_bits >> 51) & 0xfff));
+#endif
     }
 
     // Check that Date::New preserves non-NaNs in the date range and
@@ -13577,7 +13583,13 @@ THREADED_TEST(QuietSignalingNaNs) {
     } else {
       uint64_t stored_bits = DoubleToBits(stored_date);
       // Check if quiet nan (bits 51..62 all set).
+#if defined(V8_TARGET_ARCH_MIPS) && !defined(USE_SIMULATOR)
+      // Most significant fraction bit for quiet nan is set to 0
+      // on MIPS architecture. Allowed by IEEE-754.
+      CHECK_EQ(0xffe, static_cast<int>((stored_bits >> 51) & 0xfff));
+#else
       CHECK_EQ(0xfff, static_cast<int>((stored_bits >> 51) & 0xfff));
+#endif
     }
   }
 }