First step to fix issue #3568.
Changes:
- Implemented Math.clz32(), Math.fround(), Math.imul(), Math.hypot().
- Implemented all remaining Math functions with calling the standard
libm functions, but they throw UNIMPLEMENTED exception with jerry-libm,
because the necessary fdlibm functions are missing and should be ported.
All Math related test262 tests pass (except function name and length tests)
JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác oszi@inf.u-szeged.hu