Also suppress uniques in cmm dumps with `-dsuppress-uniques`.

Authored by AndreasK on Jun 4 2018, 4:50 PM.

Description

Also suppress uniques in cmm dumps with -dsuppress-uniques.

Allows easier structural comparison of Cmm code.

Before:

       cxCH: // global
           _suEU::P64 = R1;
           if ((Sp + -16) < SpLim) (likely: False) goto cxCI; else goto
cxCJ;

After

       _lbl_: // global
           __locVar_::P64 = R1;
           if ((Sp + -16) < SpLim) (likely: False) goto cxBf; else goto
cxBg;

Test Plan: Looking at dumps, ci

Reviewers: bgamari, simonmar

Reviewed By: bgamari

Subscribers: rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4786