always back `ty::Const` by an `Allocation`#58486

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oli-obk wants to merge 23 commits intorust-lang:masterfrom

oli-obk:import_miri_from_future

Commits on Feb 14, 2019

Setup `ty::Const` to allow `ConstValue::Scalar` to be backed by an allocation
oli-obk
committed
Fiddle the corresponding allocation through all `RawConst` uses
oli-obk
committed
Make const eval not use the hacky `op_to_const` function
oli-obk
committed

Commits on Feb 15, 2019