6675699: need comprehensive fix for unconstrained ConvI2L with narrowed type
Summary: Emit CastII to make narrow ConvI2L dependent on the corresponding range check.
Reviewed-by: kvn, roland

8146629: Make phase->is_IterGVN() accessible from Node::Identity and Node::Value
Summary: Change arguments of Node::Identity() and Node::Value() from PhaseTransform* to PhaseGVN*.
Reviewed-by: kvn, roland

8145322: Code generated from unsafe loops can be slightly improved
Summary: improve code generated from checkIndex and unsafe loops
Reviewed-by: kvn, thartmann

8139771: Eliminating CastPP nodes at Phis when they all come from a unique input may cause crash
Summary: Lost dependency when CastPP at Phis are eliminate
Reviewed-by: kvn

8069191: moving predicate out of loops may cause array accesses to bypass null check
Summary: Remove CastPP nodes only during final graph reshape
Reviewed-by: kvn, jrose

8054478: C2: Incorrectly compiled char[] array access crashes JVM
Summary: dead backbranch in main loop results in erroneous array access
Reviewed-by: kvn, iveresov

8001532: C2 node files refactoring
Summary: Split C2 node files into cast, convert, countbits, intrinsic, move, narrowptr and opaquenode classes
Reviewed-by: kvn, morris