RFR(L): 8212245 Remove Thread-Local Value Buffer

[Frederic Parain]

Please review this large but simple patch removing the Thread-Local Value Buffer.
This buffer used by the interpreter didn’t demonstrate performance improvements
and it causes complexity in the JIT code.

CR: https://bugs.openjdk.java.net/browse/JDK-8212245
Webrev: http://cr.openjdk.java.net/~fparain/8212245/webrev.00/index.html

Testing: hotspot_jtreg:hotspot_valhalla on Linux/Mac/Windows.

Thank you,

Fred