8023217: Additional floorDiv/floorMod/multiplyExact methods for java.lang.Math
Summary: Add new methods with long, int signatures.
Reviewed-by: darcy, scolebourne

8014296: DivModTests should not compare pointers
Reviewed-by: darcy

8004066: TEST_BUG: test/java/lang/Math/DivModTests.java assumes ArithmeticException message
Reviewed-by: twisti, alanb, dholmes

6282196: There should be Math.mod(number, modulo) methods
Summary: added the requested methods
Reviewed-by: darcy, emcmanus, alanb
Contributed-by: roger.riggs@oracle.com