[7u] RFR: 8054478: C2: Incorrectly compiled char[] array access crashes JVM

[Vladimir Kempik]

Hello

Please review this backport of 8054478 to jdk7.
Few changes was needed to make it compatible with jdk7u:
- in connode.cpp use res->filter() instead of res->filter_speculative()
- enable TiredCompilation in testcase
- few other small changes.

JBS: https://bugs.openjdk.java.net/browse/JDK-8054478
Webrev: http://cr.openjdk.java.net/~vkempik/8054478/webrev.00/
Testing: jprt
Original fix: 
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/49dd956bc8c0

Thanks, Vladimir.