incr.comp.: Fix Span hashing in various ways#46301

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michaelwoerister wants to merge 2 commits intorust-lang:masterfrom

michaelwoerister:stable-span-persistence

Commits on Nov 27, 2017

incr.comp.: Properly hash and encode macro expansion information.
michaelwoerister
committed
incr.comp.: Store Spans as (file,line,col,length) in incr.comp. cache.
michaelwoerister
committed