[Truffle] - A Symbol literal is the same object when created from identical strings
[Truffle] - Fixing indentation in RubySymbol class.
getCFG() on FlowGraphNode. Other small changes
BasicBlock.isEntryBB() method
markLocalVariables method since marking vars to box is such a common thing
Move isSelf up to Variable since I don't think it is a local variable (only moving predicate for now -- this only eliminates some casts atm)
[IR] new BasicBlack.isExitBB + update callers.  Also found some more isEntryBB callers.
Comment out failing Ripper tests (will go back and add issue number later).
Comment out failing glob tests (will go back and add issue number later).
[Truffle] Make conversion to JRuby explicit - better to fail with error than try to convert values we haven't thought about.
compute_MEET has redundant parameter
Comment out GH-1075 fiber spec - it times out.
[IR] IntelliJ test run: IntelliJ suggested cleanup and fixes.
Add issue numbers for commented out tests.
[IR] More IntelliJ-based cleanup.
[Truffle] - Refactoring RubySymbol.SymbolTable to use ConcurrentHashMap instead of an array.
Merge pull request #1464 from lucasallan/symbols-table

[Truffle] - A Symbol literal is the same object when created from identical strings
[Truffle] Put allocation of the standard hash map store on slow path - it seems to fail under compilation, not sure why.
[Truffle] Move hash class into its own package.
[Truffle] Call #to_ary on non-arrays arguments that respond to it before destructuring a block argument.