RFR: 8283692: Add PrintIdealPhase that includes block scheduling

[Nils Eliasson]

Hi,

This patch adds:
1) A new method Output::print_scheduling() that encapsulates the ir node printing on blocks
2) Modifying print_ideal_ir to use the print_scheduling() when there is a scheduling available
3) A new compiler phase MACH_ANALYSIS after the mach dependent optimizations.

Motivation:
This is used by the IR-test framework when testing optimizations on mach-nodes, and is a requirement to be able to test peephole-optimizations (because peephole-removed nodes are only removed from the scheduling, not from the graph.)

Having a method for print_scheduling() is also very useful when debugging.

Please review,
Nils Eliasson

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Commit messages:
 - 8283692: Add PrintIdealPhase that includes block scheduling

Changes: https://git.openjdk.java.net/jdk/pull/7960/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7960&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283692
  Stats: 40 lines in 4 files changed: 28 ins; 9 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7960.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7960/head:pull/7960

PR: https://git.openjdk.java.net/jdk/pull/7960