regression: `ANN` pragmas no longer ignored in TH-less GHC 8.2.1

Consider

module M where

{-# ANN myId "HLint: ignore" #-} 
myId :: a -> a
myId x = x

GHC 8.0.2 would simply ignore them:

$ ghc-8.0.2 -c M.hs 

M.hs:3:1: warning:
    Ignoring ANN annotation, because this is a stage-1 compiler or doesn't support GHCi

however, with a recent GHC 8.2 snapshot this just fails with

$ ghc-8.2 -c M.hs 

ghc: this operation requires -fexternal-interpreter

This is a serious problem because hlint annotations are quite popular, and this would require us to retrofit other-extensions: TemplateHaskell into the meta-data of quite a few packages on Hackage to declare that a package no longer works with a TH-less GHC (which would basically mean that ports of GHC such as the one for AIX that don't support TH will become very inconvenient to use and require to pester package authors to explicitly guard ANN pragmas with CPP... which I'm not looking forward to ;-) ).

Trac metadata

Trac field	Value
Version	8.2.1-rc1
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
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