RFR: 8263252: Improve fold_compares c2 optimizations

[Rahul Raghavan]

On Fri, 14 May 2021 17:53:20 GMT, Rahul Raghavan <rraghavan at openjdk.org> wrote:

> Started from last Roland reviewed changes in JDK-8238812
> https://openjdk.github.io/cr/?repo=jdk&pr=2758&range=01

Please note this is not ready for open review yet. 
Converted to draft PR.

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PR: https://git.openjdk.java.net/jdk/pull/4035