[commit: ghc] wip/spj-wildcard-refactor's head updated: Merge remote-tracking branch 'origin/master' into wip/spj-wildcard-refactor (e7ac58a)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/spj-wildcard-refactor' now includes:

     7c9a04d Add a note explaining why every RdrName is Located
     dbad0d5 Libdw: Fix build on 32-bit platforms
     70ee638 Libdw: Fix initial register collection on i386
     36b2139 rts: Expose more libdw symbols
     a3a8ce6 rts: Add simple resource pool
     6fbf22d rts: Add LibdwPool, a pool for libdw sessions
     bb249aa base: Add Haskell interface to ExecutionStack
     7aaeaf8 Support multiple debug output levels
     40be909 Dwarf: Ensure tick parentage is preserved
     9471562 Output source notes in extended DWARF DIEs
     1ac0476 More wibbles
     5955510 Improve constraint-used-as-type error msg
     70efb62 Add tests/monadfail/Makefile
     e587217 Add the rest of the notes for Located RdrName
     1c45f41 rts: Always export Libdw* symbols
     12dbc89 Add `PrelNames.thenAName` for `Applicative(*>)`
     f09f247 Implement new `-fwarn-noncanonical-monad-instances`
     c05fddd Rearrange error msgs and add section markers (Trac #11014).
     6d14793 Add -Wcompat warning flag group
     e506f02 Rewrite checkUniques and incorporate into validate
     8c5fe53 DynFlags: Update comments to reflect new users guide
     8dc6da8 Comments only
     5e04c38 Simplify the MonadFail code
     e7ac58a Merge remote-tracking branch 'origin/master' into wip/spj-wildcard-refactor