RFR: 8267265: Use new IR Test Framework to create tests for C2 Ideal transformations [v3]

[Cesar Soares]

> 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.

Cesar Soares has updated the pull request incrementally with one additional commit since the last revision:

  Fix typos

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7434/files
  - new: https://git.openjdk.java.net/jdk/pull/7434/files/8c66e0e5..61d0a1a7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7434&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7434&range=01-02

  Stats: 21 lines in 3 files changed: 0 ins; 0 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7434.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7434/head:pull/7434

PR: https://git.openjdk.java.net/jdk/pull/7434