Updated CI specs to RubySpec 57b670b8.
Fixed Symbol#to_proc specs for 1.8 behavior.
Fixed Symbol#to_proc for 1.9.
Merge pull request #2189 from ryoqun/block-environment-equality

 Don't consider name and line for BlockEnvironment's equality
Support JIT-ed method profiling
Remove unneeded constructor
Fix native_int
Clean up
Clean-up
Remove hack code
Remove unneeded guard