RFR: 8293287 add ReplayReduce flag

[Vladimir Kozlov]

On Fri, 2 Sep 2022 01:20:26 GMT, Dean Long <dlong at openjdk.org> wrote:

> Add an experimental flag to help developers "reduce" a replay file.
> 
> As a first step, I plan to simulate reduced inlining. This will output multiple "compile" lines as if the first level of inlining never happened:
> A --> B --> C
> A --> D --> E
> becomes
> B --> C
> D --> E
> Developers can repeat iteratively until the replay crash no longer reproduces.

src/hotspot/share/ci/ciEnv.cpp line 1651:

> 1649:   if (task) {
> 1650: #ifdef COMPILER2
> 1651:     if (ReplayReduce && compiler_data() != NULL) {

Is this feature when you are replaying compilation? If yes, add `ReplayCompiles` check too.

src/hotspot/share/opto/compile.cpp line 4576:

> 4574: }
> 4575: 
> 4576: void Compile::dump_inline_data_reduced(outputStream* out) {

Add `assert(ReplayReduce`.

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PR: https://git.openjdk.org/jdk/pull/10134