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Misc changes from my parallel rustc branch - #49030

Merged

alexcrichton merged 9 commits into

rust-lang:masterfrom

Mar 23, 2018

Merged

Misc changes from my parallel rustc branch#49030
alexcrichton merged 9 commits into
rust-lang:masterfrom
Zoxc:misc

Commits on Mar 17, 2018
- Remove unused imports
  Zoxc
  committed
  f53d4af
- Make Span and Symbol implement Send and Sync
  Zoxc
  committed
  3fa69c9
- Remove rustc_global!
  Zoxc
  committed
  1dbc84d
- Don't get the global lock in the fast case
  Zoxc
  committed
  1551ef1
- Replace Rc with Lrc
  Zoxc
  committed
  697d3be
- Add an Default impl for Lock
  Zoxc
  committed
  8e5eb02
- Add OnDrop
  Zoxc
  committed
  37f9c7f
- Minor cleanup
  Zoxc
  committed
  ec4a9c6
- Make interners thread-safe
  Zoxc
  committed
  e09c2ff