[WIP] Preliminary work splitting const qualification into separate passes#52518

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alexreg wants to merge 10 commits intorust-lang:masterfrom

alexreg:const-qualif

Commits on Jul 22, 2018

Changed use of `IndexVec` to `IdxSetBuf` in `Qualifier`.
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Moved static-array-across-crate test from compile-fail to run-pass.
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Split const qualification into three passes (mutable interior, needs drop, const checker).
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Commits on Aug 8, 2018

Addressed concerns raised in review.
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