RFR(XS): 8202425: [s390] C2: Wrong unsigned comparison with 0

[Doerr, Martin]

Hi,

we have observed many errors after JDK-8200303 on s390 which are caused by a wrong node in s390.ad:
compU_reg_imm0. It's used for unsigned comparison with 0, but it's implemented as signed comparison.

We can simply remove this node because we have compU_reg_uimm in place which works correctly (just with a larger encoding).

Please review:
http://cr.openjdk.java.net/~mdoerr/8202425_s390_cmpU0/webrev.00/

Best regards,
Martin

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