More hotspot tests and some backported fixes

[Mark Wielaard]

Hi,

I noticed openjdk6 and openjdk7 seem to have a mutually exclusive set of
tests under hotspot/test/compiler. Since I believe having more tests is
a good thing I merged them in icedtea6. That uncovered two crasher bugs
in the hotspot form openjdk6 that we use. So I tracked down the fixes
for those and backported them (patches attached). All 20 tests now PASS.

It is probably a good idea to also merge the tests from 6 to 7. But I
haven't done that yet.

Note that again I did only backport for the hotspot from openjdk6, not
the one that zero/shark uses (7b24).

Cheers,

Mark
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