Remove the compiler support for exclusivity warnings.
Leave runtime support for exclusivity warnings in non-release builds
only for unit testing convenience.
Remove a test case that checked the warning log output.
Modify test cases that relied on successful compilation in the
presence of exclusivity violations.
Fixes: <rdar://problem/45146046> Remaining -swift-version 3 tests for exclusivity
In AccessEnforcementSelection, treat passing a projection from a box to
a partial_apply as an escape to force using dynamic enforcement on the box.
This will now correctly use dynamic enforcement on variables that are taken
as inout and also captured by storage address in a closure:
var x = ...
x.mutatingMethod { ... use x ...}
but does pessimize some of our existing enforcement into dynamic since
access enforcement selection.
Ideally we would distinguish between escaping via an nonescaping closures
(which can only conflict with accesses that are in progress) and
escaping via escaping closures (which can conflict for any reachable code
after the escape)
