RFR: 8283692: Add PrintIdealPhase that includes block scheduling

[Christian Hagedorn]

On Fri, 25 Mar 2022 14:47:44 GMT, Nils Eliasson <neliasso at openjdk.org> wrote:

> 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

Otherwise, looks good!

src/hotspot/share/opto/output.cpp line 328:

> 326:   pd_perform_mach_node_analysis();
> 327: 
> 328:   C->print_method(CompilerPhaseType::PHASE_MACHANALYSIS, 4);

I suggest to go with an underscore as mentioned in the PR description:
`PHASE_MACH_ANALYSIS`.

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Marked as reviewed by chagedorn (Reviewer).

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