Use computeEffectiveProfiling to determine defaults, cleans up flag display.

Before:
    In order, the following would be built (use -v for more details):
     - Cabal-2.1.0.0 (lib) --enable-library-profiling (first run)

After:
    In order, the following would be built (use -v for more details):
     - Cabal-2.1.0.0 (lib) (first run)

Signed-off-by: Edward Z. Yang <ezyang@fb.com>

cabal-install/Distribution/Client/ProjectOrchestration.hs

@@ -126,6 +126,7 @@ import           Distribution.Simple.LocalBuildInfo
                    ( ComponentName(..), pkgComponents )
 import qualified Distribution.Simple.Setup as Setup
 import           Distribution.Simple.Command (commandShowOptions)
+import           Distribution.Simple.Configure (computeEffectiveProfiling)
 
 import           Distribution.Simple.Utils
                    ( die'
@@ -750,12 +751,7 @@ printPlan verbosity
             nubFlag :: Eq a => a -> Setup.Flag a -> Setup.Flag a
             nubFlag x (Setup.Flag x') | x == x' = Setup.NoFlag
             nubFlag _ f = f
-            -- TODO: Closely logic from 'configureProfiling'.
-            tryExeProfiling = Setup.fromFlagOrDefault False
-                                (configProf fullConfigureFlags)
-            tryLibProfiling = Setup.fromFlagOrDefault False
-                                (Mon.mappend (configProf    fullConfigureFlags)
-                                             (configProfExe fullConfigureFlags))
+            (tryLibProfiling, tryExeProfiling) = computeEffectiveProfiling fullConfigureFlags
             partialConfigureFlags
               = Mon.mempty {
                 configProf    =

cabal-testsuite/PackageTests/NewBuild/T3827/cabal.out

@@ -2,7 +2,7 @@
 Resolving dependencies...
 Build profile: -w ghc-<GHCVER> -O1
 In order, the following will be built:
- - p-1.0 (lib) --enable-library-profiling (first run)
+ - p-1.0 (lib) (first run)
  - q-1.0 (exe:q) --enable-profiling (first run)
 Configuring library for p-1.0..
 Preprocessing library for p-1.0..