RFR 8074067: Cleanup in java.base/share/native/libjava/Bits.c

[Ivan Gerasimov]

Hello everyone!

Code in the file Bits.c can be made a bit shorter:
First, we can remove updating the variables which aren't used:
  103         dstAddr += size;
  138         srcAddr += size;
... and alike.

Second, the 'size' variable may only be updated when 'length' becomes 
less than MBYTE.
The warning not to modify the code which has just been modified was also 
removed.

I've built jdk on all available platforms (both production and debug) to 
make sure the code is still compilable.

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8074067
WEBREV: http://cr.openjdk.java.net/~igerasim/8074067/0/webrev/

Sincerely yours,
Ivan