[dmd-internals] [D-Programming-Language/dmd] 2d2b9a: Merge pull request #4695 from WalterBright/go

[GitHub via dmd-internals]

  Branch: refs/heads/dmd-1.x
  Home:   https://github.com/D-Programming-Language/dmd
  Commit: 2d2b9a4428f9498a37539742993fdb8e537503a8
      https://github.com/D-Programming-Language/dmd/commit/2d2b9a4428f9498a37539742993fdb8e537503a8
  Author: Daniel Murphy <yebblies at gmail.com>
  Date:   2015-05-30 (Sat, 30 May 2015)

  Changed paths:
    M src/backend/gdag.c
    M src/backend/gflow.c
    M src/backend/glocal.c
    M src/backend/gloop.c
    M src/backend/go.c

  Log Message:
  -----------
  Merge pull request #4695 from WalterBright/go

Remove more ancient stuff from optimizer