* src/vm/vm.hpp (VM): Added member_vm, added functions get_current,

* src/vm/vm.hpp (VM): Added member_vm, added functions get_current,
abort, abort_errnum, and abort_errno.
* src/vm/vm.cpp: Likewise.
* src/mm/gc-boehm.cpp,
src/native/jni.cpp,
src/native/jni.hpp,
src/native/vm/gnuclasspath/gnu_java_lang_management_VMRuntimeMXBeanImpl.cpp,
src/threads/posix/condition-posix.hpp,
src/threads/posix/mutex-posix.hpp,
src/vm/exceptions.cpp,
src/vm/os.cpp,
src/vm/primitive.cpp,
src/vm/string.cpp: Use VM::get_current() instead of using vm directly,
use new abort functions.