support for Hitachi SH

[Matthias Klose]

Nobuhiro recently added support for the Hitachi SH, verifying that it does 
build, and example programs run.  jtreg test results are still outstanding. Like 
mips/mipsel SH can be big or little endian, the Debian port is little endian only.

I'll add this patch to the IcedTea6 branch; it could be added to the 1.7 branch 
as well, only adding stuff architecture specific stuff.

   Matthias

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