RFR 8216010: Change callers of build_u2_from() to call Bytes::get_Java_u2() instead

[Kim Barrett]

> On Jan 3, 2019, at 4:53 PM, Harold David Seigel <harold.seigel at oracle.com> wrote:
> 
> Hi,
> 
> Please review this small fix for JDK-8216010.  The fix removes function build_u2_from() and changes its callers to call function Bytes::get_Java_u2().
> 
> Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8216010/webrev/index.html
> 
> JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8216010
> 
> The fix was regression tested by running Mach5 tiers 1 and 2 tests and builds on Linux-x64, Windows, and Mac OS X, running Mach5 tiers 3 - 5 on Linux-x64, and by running JCK-12 Lang and VM tests on Linux-x64.
> 
> Thanks, Harold

Looks good.