Get isfinite, isinf, and isnan right in jerry-math (#4497)

- `finite` is not C99 but a BSD fp classification function, so it
  is removed.
- The standard specifies that `isnan` is a macro (just like
  `isfinite` and `isinf`), so the `isnan` function implementation
  is removed.
- `isfinite` incorrectly classified NAN as finite, which is fixed.
- `isinf` returned 1 for negative infinity. This is not a bug
  according to the standard, but is not aligned with recent glibc,
  which returns -1. This is changed to simplify testing.
- Added test cases for `isfinite` and `isinf` to the unit test of
  jerry-math.
- Added a new pass to unittests to ensure that jerry-math is
  tested.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-math/include/math.h

@@ -27,8 +27,8 @@ extern "C"
 #define HUGE_VAL    INFINITY
 
 #define isnan(x)    ((x) != (x))
-#define isinf(x)    (((x) == INFINITY) || ((x) == -INFINITY))
-#define isfinite(x) (!(isinf(x)) && (x != NAN))
+#define isinf(x)    ((x) == INFINITY ? 1 : (x) == -INFINITY ? -1 : 0)
+#define isfinite(x) (!isinf(x) && !isnan(x))
 
 /* Exponential and Logarithmic constants. */
 #define M_E        2.7182818284590452353602874713526625