Library compcertx.backend.DeadcodeX

Require compcert.backend.Deadcode.
Require ValueDomainX.

Import Errors.
Import AST.
Import ValueDomainX.
Export Deadcode.

In this file, we define per-function/module dead code elimination, without any proof.
As said in ValueDomainX, we do not consider any optimization on `const' global variables, so the read-only memory abstraction will be empty.