Lint the compiler for extraneous LANGUAGE pragmas

compiler/.hlint.yaml

compiler/GHC/ByteCode/Asm.hs

compiler/GHC/ByteCode/InfoTable.hs

compiler/GHC/ByteCode/Instr.hs

compiler/GHC/ByteCode/Linker.hs

compiler/GHC/ByteCode/Types.hs

compiler/GHC/Cmm/CLabel.hs

compiler/GHC/Cmm/Dataflow/Collections.hs

compiler/GHC/Cmm/Dataflow/Label.hs

compiler/GHC/Cmm/Node.hs

compiler/GHC/Cmm/Pipeline.hs

compiler/GHC/CmmToAsm/BlockLayout.hs

compiler/GHC/CmmToAsm/CFG.hs

compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs

compiler/GHC/CmmToAsm/Reg/Linear/PPC.hs

compiler/GHC/CmmToAsm/Reg/Linear/SPARC.hs

compiler/GHC/CmmToC.hs

compiler/GHC/Core/Coercion.hs

compiler/GHC/Core/Coercion/Axiom.hs

compiler/GHC/Core/FamInstEnv.hs