RFR: 8215547: ZGC: Fix incorrect match rule for loadBarrierWeakSlowRegNoVec

[Per Liden]

The AD matching for loadBarrierWeakSlowRegNoVec is incorrect. It should 
match against a LoadBarrierWeakSlowReg, not LoadBarrierSlowReg.

Also the format lines for loadBarrier*SlowRegXmmAndYmm are missing the 
"AndYmm" part.

Bug: https://bugs.openjdk.java.net/browse/JDK-8215547
Webrev: http://cr.openjdk.java.net/~pliden/8215547/webrev.0

/Per