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

tools/run-tests.py

@@ -72,6 +72,9 @@ JERRY_UNITTESTS_OPTIONS = [
             skip=skip_if((sys.platform == 'win32'), 'FEATURE_INIT_FINI build flag isn\'t supported on Windows,' +
                          ' because Microsoft Visual C/C++ Compiler doesn\'t support' +
                          ' library constructors and destructors.')),
+    Options('unittests-es5.1-debug-math',
+            OPTIONS_COMMON + OPTIONS_UNITTESTS + OPTIONS_PROFILE_ES51 + OPTIONS_DEBUG
+            + ['--jerry-math=on']),
 ]
 
 # Test options for jerry-tests