Previously, property names are hidden in the whole range of the
declarations. Now, it's only hidden in its own initializer range.
rdar://problem/49697202
1. Make sure the actions taken by fixits are reflected in diagnostics messages.
2. Issue missing cases diagnostics at the start of the switch statement instead of its end.
3. Use <#code#> instead of <#Code#> in the stub.
Most tests were using %swift or similar substitutions, which did not
include the target triple and SDK. The driver was defaulting to the
host OS. Thus, we could not run the tests when the standard library was
not built for OS X.
Swift SVN r24504
-Previously the range would include the right brace of the computed variable but not the left one
-Incomplete implicit getter would trigger assertion in the AST verifier.
rdar://18189904
Swift SVN r21659
