Specialising Functional Interfaces to avoid autoboxing

[ameyaKetkar]

Hello, I am a Graduate Student at Oregon State University, studying the impact of autoboxing. I have written a tool, which analyses the source code to find opportunities to refactor the code to a specialised implementation for primitives, thus eliminating autoboxing. All the changes, have been done manually, and have been verified by me.In this pull request I have specialised two instances of FunctionalInterfaces . I have many more such patches, I will be happy to contribute.

[evanw555]

@ameyaKetkar You should rebase this and resolve the conflicts