Add HasDebugCallStack to nameModule

This function is called in lots of places, so if it
every fails it's good to know from where it was called.

This is Simon's patch, part of his `wip/T2893` branch.

Test Plan: Validate

Subscribers: rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4352

compiler/basicTypes/Name.hs

@@ -194,7 +194,7 @@ instance HasOccName Name where
 
 nameUnique              :: Name -> Unique
 nameOccName             :: Name -> OccName
-nameModule              :: Name -> Module
+nameModule              :: HasDebugCallStack => Name -> Module
 nameSrcLoc              :: Name -> SrcLoc
 nameSrcSpan             :: Name -> SrcSpan