UnsafeLoad: insert uncompress operation also for null constant

--HG--
extra : rebase_source : ef203ce4c2552433434a1521810140799dca88e7
extra : amend_source : fed63d7852fe65bd7d74049ce724f29d1b56eb64
handle primitive classes with +ImmutableCode
handle error case in Array.newInstance
complain when deleting side effecting nodes from snippets
fold getClassLoader for constant classes
support adding pid to LogFile name
don't create profiles for exact types