v4.3.0

LLVM v4.3.0

Diff since v4.2.0

Closed issues:

• Attributes are non-roundtrippable (#186)

Merged pull requests:

• Add wrappers for LLVM's cloning utilities. (#257) (@maleadt)
• Add a wrapper for llvm::Function's deleteBody. (#258) (@maleadt)
• Make some iterators a subtype of AbstractVector. (#259) (@maleadt)
• Optimizations (#260) (@maleadt)