Make 1.7 run green by pending out this regression (made GH #1488 to track it)
Passed on my machine but not on travis...adding to same issue as other regression
Remove use of Java 8-only String.join API.
Bump invokebinder to 1.3 release.
[IR] Various String bits.

* Get StringLiteral constructing correctly, with cached ByteList
  and proper encoding.
* AsString used invokevirtual for IRubyObject.
* Implement CompoundString operand.
[IR] Implement Regexp (literal).
[IR] Implement EQQInstr.
[Truffle] - RubyString can be compared to a RubySymbol.
[Truffle] - Using toString() method to compare a RubyString with a RubySymbol.
[Truffle] - Making more two language specs related to Symbols pass.

Those specs were fixed in the last commit, but I forgot to remove from
the ignored specs lists.
Add missing temporarylocalvariable visitor on encode of persist
trivial remove unused import
Change OperandTypes to be distinct between boxed and unboxed values.  Added rest of changes to IRVisitor so persistence encoding is working again (reading still broken)
[IR] Implement GVarAliasInstr.
[IR] Implement Match, Match2, and Match3 instructions.
[IR] Implement OptArgMultipleAsgnInstr...I think.
Remove vestiges of GSoC persistence
Remove defunct NotNode from AST and consumers.
Remove defunct NotInstr.
[Truffle] - Initial support to ByteList on RubyString.

This is the first step to make the encoding works with RubyString.