Hoopl: remove dependency on Hoopl package

This copies the subset of Hoopl's functionality needed by GHC to
`cmm/Hoopl` and removes the dependency on the Hoopl package.

The main motivation for this change is the confusing/noisy interface
between GHC and Hoopl:
- Hoopl has `Label` which is GHC's `BlockId` but different than
  GHC's `CLabel`
- Hoopl has `Unique` which is different than GHC's `Unique`
- Hoopl has `Unique{Map,Set}` which are different than GHC's
  `Uniq{FM,Set}`
- GHC has its own specialized copy of `Dataflow`, so `cmm/Hoopl` is
  needed just to filter the exposed functions (filter out some of the
  Hoopl's and add the GHC ones)
With this change, we'll be able to simplify this significantly.
It'll also be much easier to do invasive changes (Hoopl is a public
package on Hackage with users that depend on the current behavior)

This should introduce no changes in functionality - it merely
copies the relevant code.

Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>

Test Plan: ./validate

Reviewers: austin, bgamari, simonmar

Reviewed By: bgamari, simonmar

Subscribers: simonpj, kavon, rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D3616

2 files changed, 4 insertions, 2 deletions

diff --git a/compiler/nativeGen/SPARC/CodeGen.hs b/compiler/nativeGen/SPARC/CodeGen.hs
index 3e9058bdfd..71d320fa63 100644
--- a/compiler/nativeGen/SPARC/CodeGen.hs
+++ b/compiler/nativeGen/SPARC/CodeGen.hs
@@ -44,7 +44,8 @@ import BlockId
 import Cmm
 import CmmUtils
 import CmmSwitch
-import Hoopl
+import Hoopl.Block
+import Hoopl.Graph
 import PIC
 import Reg
 import CLabel
diff --git a/compiler/nativeGen/SPARC/Ppr.hs b/compiler/nativeGen/SPARC/Ppr.hs
index 5d6b6f70dc..88b04b952a 100644
--- a/compiler/nativeGen/SPARC/Ppr.hs
+++ b/compiler/nativeGen/SPARC/Ppr.hs
@@ -39,7 +39,8 @@ import PprBase
 import Cmm hiding (topInfoTable)
 import PprCmm()
 import CLabel
-import Hoopl
+import Hoopl.Label
+import Hoopl.Collections
 
 import Unique           ( Uniquable(..), pprUniqueAlways )
 import Outputable