Please keep the list sorted (as in sort.Strings of the lines).
cmd/5a: removed support for R9/R10 (use m/g instead) (CL 9840043).
+cmd/cgo, cmd/go: support including C++ code with cgo (CL 8248043).
fmt: indexed access to arguments in Printf etc. (CL 9680043).
+go/build: support including C++ code with cgo (CL 8248043).
io: Copy prioritizes WriterTo over ReaderFrom (CL 9462044).
testing: AllocsPerRun is now quantized to an integer (the type is still float64) (CL 9837049).