RFR(M/L) : 8209611 : use C++ compiler for hotspot tests

[Vladimir Ivanov]

> http://cr.openjdk.java.net/~iignatyev//8209611/webrev.02/index.html 
Reviewed.

Best regards,
Vladimir Ivanov

>> On Aug 20, 2018, at 11:07 PM, Igor Ignatyev <igor.ignatyev at oracle.com> wrote:
>>
>>>> It has been discussed (not widely enough and I accept that) in 8209547 and the related email thread b/w JC(cc'ed) and myself.
>>>> as I said, I might went a way too far, so I'll revert changes in the non-vmTestbase tests and made appropriate changes in makefiles. what do you think?
>>>
>>> I think I need to see what you mean exactly :)
>> sure, it will take some time for me to do that, hopefully will upload new webrevs tomorrow morning PT. but the basic idea is to leave files in test/hotspot/jtreg/compiler, runtime, gc, native_sanity, serviceability, testlibrary as .c files, exactly as they were before, and restore corresponding filenames in make/test/JtregNativeHotspot.gmk.
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