Hygiene opt-out for idents in expansion of declarative macros#47992

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alexreg wants to merge 10 commits intorust-lang:masterfrom

alexreg:hygiene-optout

Commits on May 9, 2018

Fixed bug with modification of `SyntaxContext` for escaped idents.
alexreg
committed
Added compile-fail test for `$#metavar` hygiene opt-out syntax.
alexreg
committed

Commits on May 10, 2018

Added feature gate (`macro_hygiene_optout`).
alexreg
committed