[compiler-rt] [sanitizer_common] Move container overflow declarations into new file (PR #168882)

[Dan Blackwell via llvm-commits]

DanBlackwell wrote:

https://github.com/llvm/llvm-project/pull/168955 this is a much nicer solution, I'd far rather go with it than open this can of worms.

https://github.com/llvm/llvm-project/pull/168882