RFR: 8168318 Use cmpdi instead of li/cmpd

[Igor Henrique Soares Nunes]

Hi all,

The following change, fix the issue addressed in Gustavo's previous e-mail:





=== Use cmpdi instead of li/cmpd (r14 killed after this).

3fff60240bec:      li      r14,0

3fff60240bf0:      cmpld   cr6,r3,r14



In order to fix this issue a new instruct was created to match Set crx (CmpP src1 src2) when src2 is a null pointer.



Webrev: https://igorsnunes.github.io/openjdk/webrev/8168318/

Bug: https://bugs.openjdk.java.net/browse/JDK-8168318



Thanks,



Igor Nunes

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