Merge commit 'refs/pull/1906/head' into wip/pr-1906

* commit 'refs/pull/1906/head': (24 commits)
  SI-6675 Test new warning under -Xoldpatmat.
  SI-6675 -Xlint arity enforcement for extractors
  SI-6905 - Switch to sneakyThrows instead of Unsafe.throwException as per new jsr166y to avoid issues with Android
  SI-6963 Deprecates -Xmigration switch
  SI-5954 Implementation restriction preventing companions in package objs
  SI-6479 Don't lift try exprs in label arguments.
  SI-6082 Conditionally expand @ann(x) to @ann(value = x)
  SI-6126 Test case for varargs of tagged primitives.
  SI-5440 Test case for exhaustiveness check
  SI-5340 Change println to log
  SI-6955 switch emission no longer foiled by type alias
  clean up synthesizePartialFunction
  rework partial function synthesis
  SI-6925 use concrete type in applyOrElse's match's selector
  SI-5189 detect unsoundness when inferring type of match
  SI-6946, SI-6924 Greatly improves IsTraversableLike docs
  SI-6555 Scaladoc's class filter shouldn't drop the last character
  Backport of SI-6846.
  Fixes SI-6521, overrides Range#head to be faster
  SI-6641 Deprecate SwingWorker
  ...

Conflicts:
	src/compiler/scala/tools/nsc/typechecker/Typers.scala

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