RFE: configuration for compiling HotSpot with Clang

[Florian Weimer]

* Volker Simonis:

> For the impatient the summary is that Clang is still slower than
> current GCC versions and the generated code seems to be slightly
> slower as well.

Interesting indeed.  Did you use precompiled headers?

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Florian Weimer                <fweimer at bfk.de>
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