RFR (S) 8141044: C1 should fold (this == null) to false

[Aleksey Shipilev]

Hi,

I would like to suggest a simple improvement in C1: folding "(this ==
null)" to "false". This is a minor nit in A*FU performance with C1.

JIRA:
  https://bugs.openjdk.java.net/browse/JDK-8141044

Webrev:
  http://cr.openjdk.java.net/~shade/8141044/webrev.01/

The patch passes JPRT, and improves the generated code in targeted
benchmarks.

Thanks,
-Aleksey

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