RFR(S) 8248445: Use of AbsI/AbsL nodes should be limited to supported platforms

[Boris Ulasevich]

Hi all,

Please review a simple change to C2 to fix a regression: AbsI/AbsL
nodes are used without checking that the platform supports them
(for now it is the issue for ARM32 and 32-bit x86 platforms).

http://cr.openjdk.java.net/~bulasevich/8248445/webrev.02
http://bugs.openjdk.java.net/browse/JDK-8248445

thanks,
Boris