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

[Erik Joelsson]

On Wed, 7 Apr 2021 22:37:28 GMT, Ioi Lam <iklam 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

Marked as reviewed by erikj (Reviewer).

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