RFR: 8287828: Fix so that one can select jtreg test case by ID from make [v2]

[Leo Korinth]

On Tue, 7 Jun 2022 13:26:52 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> make/RunTests.gmk line 47:
>> 
>>> 45: define IfPrepend
>>> 46: $(if $(strip $1),$(strip $2)$(strip $1),)
>>> 47: endef
>> 
>> These two probably fits better in make/common/Utils.gmk. 
>> 
>> Also please have a look at the [Code Conventions for the Build System](http://openjdk.java.net/groups/build/doc/code-conventions.html). One liner macros like this we like to format like this:
>> 
>> 
>> IfPrepend = \
>>   $(if $(strip $1),$(strip $2)$(strip $1),)
>
> I moved them both to `make/common/Utils.gmk`.

(and made them one-liners, but with indentation four to match the code around)

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