RFR: 8287828: Fix so that one can select jtreg test case by ID from make

[David Holmes]

On Sat, 4 Jun 2022 01:51:20 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> One can select a testcase by ID when running a jtreg test case directly from jtreg (using the testcase.java#testID syntax). However, this has not been possible to do when launching jtreg indirectly from make.
> 
> This fix attempts to address this issue. I have not tested this thoroughly yet, I wanted to show the code to get feedback first. The idea is to *not* emulated destructive imperative assignments through the use of eval. I instead try to handle it in a functional style without reassigning variables. I have tried to make the change as small as possible.
> 
> I am not used to change the build system, so I would appreciate thorough review.
> 
> `IfAppend` and `IfPrepend` are general purpose functions. If similar functions exists elsewhere inside the code base or in make itself I should probably use those instead. If they do not exist, they might be useful elsewhere and maybe should be placed in a common make file instead of the RunTests.gmk file.

Let me ask the obvious "dumb" question ... why does this have to be so complicated? Why isn't the name of the test simply passed through to jtreg as typed?

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PR: https://git.openjdk.java.net/jdk/pull/9028