+* llvm-ar now suports thin archives.
+
+* llvm doesn't produce .data.rel.ro.local or .data.rel sections anymore.
+
+* aliases to available_externally globals are now rejected by the verifier.
+
+* the IR Linker has been split into IRMover that moves bits from one module to
+ another and Linker proper that decides what to link.
+
+* Support for dematerializing has been dropped.
+