RFR (S) 8219712: code_size2 is too small on new Skylake CPUs

[Schmelter, Ralf]

Please review the following small patch. It increases the code_size2 constant by 1000 bytes, since it was too small when doing a Windows slowdebug build on my Skylake based system.

I've increased code_isze2 in 500 bytes increments and 1000 additional bytes was need to avoid the assertion indicating we are exceeding the reserved code space.

webrev: http://cr.openjdk.java.net/~rschmelter/webrevs/8219712/webrev.0/
bug: https://bugs.openjdk.java.net/browse/JDK-8219712

Best regards,
Ralf