make sure a busy-waiting loop can't block the GC (and hence the whole VM)
prevent busywait loops from blocking the VM in interpret mode
Merge pull request #135 from joshuawarner32/no-busy-block

make sure a busy-waiting loop can't block the GC and hence the whole VM
Move Unsafe.compareAndSwapLong from ...

... classpath-openjdk.cpp to builtin.cpp.
Merge pull request #138 from soc/topic/unsafe-compareAndSwap

Move Unsafe.compareAndSwapLong from classpath-openjdk.cpp to builtin.cpp