[PATCH v4 3/3] powerpc test_emulate_step: add testcases for divde[.] and divdeu[.] instructions

add testcases for divde, divde., divdeu, divdeu. emulated instructions to cover few scenarios, * with same dividend and divisor to have undefine RT for divdeu[.] * with divide by zero to have undefine RT for both divde[.] and divdeu[.] * with negative

[PATCH v4 3/3] powerpc test_emulate_step: add testcases for divde[.] and divdeu[.] instructions

add testcases for divde, divde., divdeu, divdeu. emulated instructions to cover few scenarios, * with same dividend and divisor to have undefine RT for divdeu[.] * with divide by zero to have undefine RT for both divde[.] and divdeu[.] * with negative