Previously, the `@_accessorBlock` disambiguation attribute was only
emitted for observed variables. But We need `@_accessorBlock`
disambiguation marker for simple stored properties with non-public
setters in `@frozen` types too.
rdar://171819084
.swiftinterface sometimes prints a pattern binding initializer and the
accessor block. However the parser doesn't expect such constructs and
the disambiguation from trailing closures would be fragile. To make it
reliable, introduce a disambiguation marker `@_accessorBlock` .
`ASTPrinter` prints it right after `{` only if 1) The accessor block is
for a pattern binding declaration, 2) the decl has an initializer
printed, and 3) the non-observer accessor block is being printed. In the
parser, if the block after an initializer starts with
`{ @_accessorBlock`, it's always parsed as an accessor block instead of
a trailing closure.
rdar://140943107
Rintaro Ishizaki
Becca Royal-Gordon