hg: jdk9/sandbox/jdk: 4026465: Provide more byte array constructors for BigInteger

[chris.hegarty at oracle.com]

Changeset: cbe302e284b5
Author:    bpb
Date:      2015-01-09 17:27 -0800
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/cbe302e284b5

4026465: Provide more byte array constructors for BigInteger
Summary: Add two's complement and sign-magnitude constructors for byte arrays with offset and length.
Reviewed-by: darcy, alanb, scolebourne

! src/java.base/share/classes/java/math/BigInteger.java
! test/java/math/BigInteger/BigIntegerTest.java