RFR: 8264874: Build interim-langtools for HotSpot only if Graal is enabled

[Ioi Lam]

On Thu, 8 Apr 2021 01:13:45 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Many HotSpot developers make only the `hotspot` target, and copy the resulting `libjvm.so` into an already-build JDK image.
>> 
>> HotSpot requires `interim-langtools` only when Graal is enabled. When Graal is disabled, we can avoid building `interim-langtools`. This improves the build time of `make hotspot` by about 20 seconds, or about 15%:
>> 
>> Old:
>> $ make clean
>> $ time make hotspot
>> ....
>> real 1m57.905s
>> user 42m22.524s
>> sys 3m7.372s
>> 
>> New:
>> $ make clean
>> $ time make hotspot
>> ....
>> real 1m39.916s
>> user 41m59.984s
>> sys 3m3.188s
>
> Good.

Thanks @vnkozlov and @erikj79 for the review!

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PR: https://git.openjdk.java.net/jdk/pull/3389