RFR(S) 8234891: AArch64: Fix build failure after JDK-8234387

[Boris Ulasevich]

Hi,

Please review the fix in aarch64.ad to address the build issue "Ideal 
node missing: CmpOp" raised after recent change in C2. The intuitive 
operand name case correction CmpOp->cmpOp fixes the build, but leads to 
unworkable jvm. Removing the match rule works good and jdk/hotspot tests 
are Ok.

http://bugs.openjdk.java.net/browse/JDK-8234891
http://cr.openjdk.java.net/~bulasevich/8234891/webrev.00

ARM32 build fails too. I will fix the problem in arm32.ad file separately.

thanks,
Boris