hotswap: New patch. Main changes are:
- Improved instance update performance (mark&compact modification, compressed storage of instance update information)
- Improved stability (increased own test suite, more tests of the standard class redefinition test suite passing)
- Correct handling of static fields: Values are copied from old class instead of reexecuting the static initializer of the new class.
- Introduction of mutator methods: On every changed instance the method $mutator() is executed if available.
- Rebiased to jdk7-b81

        1 Initial version contributed by Thomas Wuerthinger (thomas.wuerthinger@gmx.at), April 1, 2009

        2 Detailed information: http://wikis.sun.com/display/mlvm/HotSwap