RFR: 8290248: Implement MaxINode::Ideal transformation

[Bhavana-Kilambi]

This patch implements Ideal transformations for MaxINode, which are
similar to the ones defined for MinINode to transform/optimize a couple
of commonly occuring patterns such as -

MaxI(x + c0, MaxI(y + c1, z)) ==> MaxI(AddI(x, MAX2(c0, c1)), z) when x
== y
MaxI(x + c0, y + c1) ==> AddI(x, MAX2(c0, c1)) when x == y

IR tests to test the Ideal transformations of both MaxI and MinI nodes
are also included in this patch.

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Commit messages:
 - 8290248: Implement MaxINode::Ideal transformation

Changes: https://git.openjdk.org/jdk/pull/9703/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9703&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290248
  Stats: 202 lines in 4 files changed: 201 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9703.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9703/head:pull/9703

PR: https://git.openjdk.org/jdk/pull/9703