Remove `RunResult(..)`, `runStmt`, and `runStmtWithLocation`.  These
were all deprecated and documented as slated for removal in GHC 7.14,
which I figure means 8.2.

See cf7573b8 for an explanation of why
this change was made.

Reviewers: simonpj, hvr, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2949

GHC Trac Issues: #13095