RFR: 8267265: Use new IR Test Framework to create tests for C2 IGV transformations

[John Tortugo]

Hi, can I please get some reviews for this Pull Request? Here is a summary of the changes:

- Add tests, using the new IR-based test framework, for several of the Ideal transformations on Add, Sub, Mul, Div, Loop nodes and some simple Scalar Replacement transformations.
- Add more default IR regex's to IR-based test framework.
- Changes to Sub, Div and Add Ideal nodes to that transformations on Int and Long types are the whenever possible same.
- Changes to Sub*Node, Div*Node and Add*Node Ideal methods to fix some bugs and include new transformations.
- New JTREG "ir_transformations" test group under test/hotspot/jtreg.

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Commit messages:
 - Fix carriage returns one more time.
 - Fix more carriage returns.
 - Fixing carriage return chars.
 - Adding some tests for Ideal transformations.

Changes: https://git.openjdk.java.net/jdk/pull/5135/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5135&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267265
  Stats: 1889 lines in 15 files changed: 1833 ins; 45 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5135.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5135/head:pull/5135

PR: https://git.openjdk.java.net/jdk/pull/5135