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Hadrian: support stage1 profiling

sheaf requested to merge sheaf/ghc:devel1 into master

This adds the profiled_stage1_ghc flavour transformer, which allows developers to compile GHC with profiling enabled for the stage 1 compiler, e.g. with the Hadrian invocation:

hadrian/build --flavour=devel1+profiled_stage1_ghc

This is useful when one is debugging the stage 1 compiler, e.g. because the compiler can't build base or the stage 2 compiler.

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