RFR: 8145096: Undefined behaviour in HotSpot

[Andrew Haley]

OK.  I think this change addresses all of your points.

http://cr.openjdk.java.net/~aph/8145096-3

The complex (and incorrect)

   ((jlong)CONST64(1) << (jlong)(BitsPerJavaLong - con)) - CONST64(1);

is merely a difficult way to write

   jlong((~ UCONST64(0)) >> con)

Andrew.