CodeGen: Way to dump cmm only once (#11717)

The `-ddump-cmm` put all stages of Cmm processing into one output.
This patch changes its behavior and adds two more options to make
Cmm dumping flexible.

- `-ddump-cmm-from-stg` dumps only initial version of  Cmm right after
   STG->Cmm codegen
- `-ddump-cmm` dumps the final result of the Cmm pipeline processing
- `-ddump-cmm-verbose` dumps intermediate output of each Cmm pipeline
   step
- `-ddump-cmm-proc` and `-ddump-cmm-caf` seems were lost. Now enabled

Test Plan: ./validate

Reviewers: thomie, simonmar, austin, bgamari

Reviewed By: thomie, simonmar

Subscribers: simonpj, thomie

Differential Revision: https://phabricator.haskell.org/D2393

GHC Trac Issues: #11717

1 files changed, 9 insertions, 1 deletions

diff --git a/utils/mkUserGuidePart/Options/CompilerDebugging.hs b/utils/mkUserGuidePart/Options/CompilerDebugging.hs
index ce84a2a48b..c886156d80 100644
--- a/utils/mkUserGuidePart/Options/CompilerDebugging.hs
+++ b/utils/mkUserGuidePart/Options/CompilerDebugging.hs
@@ -20,8 +20,16 @@ compilerDebuggingOptions =
          , flagDescription = "Dump interpreter byte code"
          , flagType = DynamicFlag
          }
+  , flag { flagName = "-ddump-cmm-from-stg"
+         , flagDescription = "Dump STG-to-C-- output"
+         , flagType = DynamicFlag
+         }
+  , flag { flagName = "-ddump-cmm-verbose"
+         , flagDescription = "Show output from each C-- pipeline pass"
+         , flagType = DynamicFlag
+         }
   , flag { flagName = "-ddump-cmm"
-         , flagDescription = "Dump C-- output"
+         , flagDescription = "Dump the final C-- output"
          , flagType = DynamicFlag
          }
   , flag { flagName = "-ddump-core-stats"