revert: EXPECT_FP_IS_NAN check

Signed-off-by: Krishna Pandey <[email protected]>

Author: krishna2803

libc/test/UnitTest/FPMatcher.h

@@ -271,7 +271,7 @@ struct ModifyMXCSR {
       expected)                                                                \
       .match(actual)
 
-#define EXPECT_FP_IS_NAN(actual) EXPECT_TRUE(FPBits(actual).is_nan())
+#define EXPECT_FP_IS_NAN(actual) EXPECT_TRUE((actual) != (actual))
 
 #define ASSERT_FP_EQ(expected, actual)                                         \
   ASSERT_THAT(actual, LIBC_NAMESPACE::testing::getMatcher<                     \