Merge branch 'wip/ghc-8.8-merges' into ghc-8.8

HACKING.md

README.md

boot

compiler/basicTypes/Id.hs

compiler/basicTypes/PatSyn.hs

compiler/basicTypes/Unique.hs

compiler/cmm/CmmMachOp.hs

compiler/cmm/CmmParse.y

compiler/cmm/PprC.hs

compiler/codeGen/StgCmmBind.hs

compiler/coreSyn/CorePrep.hs

compiler/coreSyn/CoreTidy.hs

compiler/deSugar/Check.hs

compiler/ghc.cabal.in

compiler/ghci/ByteCodeAsm.hs

compiler/ghci/ByteCodeGen.hs

compiler/ghci/ByteCodeInstr.hs

compiler/ghci/Linker.hs

compiler/llvmGen/LlvmCodeGen.hs

compiler/llvmGen/LlvmCodeGen/Base.hs