RFR: 8267265: Use new IR Test Framework to create tests for C2 IGV transformations [v4]

[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.

John Tortugo has updated the pull request incrementally with 146 additional commits since the last revision:

 - Fix merge mistake.
 - Merge branch 'jdk-8267265' of https://github.com/JohnTortugo/jdk into jdk-8267265
 - Addressing PR feedback: move tests to other directory, add custom tests, add tests for other optimizations, rename some tests.
 - 8273197: ProblemList 2 jtools tests due to JDK-8273187
   8273198: ProblemList java/lang/instrument/BootClassPath/BootClassPathTest.sh due to JDK-8273188
   
   Reviewed-by: naoto
 - 8262186: Call X509KeyManager.chooseClientAlias once for all key types
   
   Reviewed-by: xuelei
 - 8273186: Remove leftover comment about sparse remembered set in G1 HeapRegionRemSet
   
   Reviewed-by: ayang
 - 8273169: java/util/regex/NegativeArraySize.java failed after JDK-8271302
   
   Reviewed-by: jiefu, serb
 - 8273092: Sort classlist in JDK image
   
   Reviewed-by: redestad, ihse, dfuchs
 - 8273144: Remove unused top level "Sample Collection Set Candidates" logging
   
   Reviewed-by: iwalulya, ayang
 - 8262095: NPE in Flow$FlowAnalyzer.visitApply: Cannot invoke getThrownTypes because tree.meth.type is null
   
   Co-authored-by: Jan Lahoda <jlahoda at openjdk.org>
   Co-authored-by: Vicente Romero <vromero at openjdk.org>
   Reviewed-by: jlahoda
 - ... and 136 more: https://git.openjdk.java.net/jdk/compare/ac430bf7...463102e2

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5135/files
  - new: https://git.openjdk.java.net/jdk/pull/5135/files/ac430bf7..463102e2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5135&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5135&range=02-03

  Stats: 2570 lines in 18 files changed: 1410 ins; 1146 del; 14 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