swift234

AST Verifier: if a BraceStmt (including function body brace stmt) is marked as
implicit, we should not verify source locations with this patch.

LLDB creates ASTs that contain some pieces of AST that came from the parser,
and some other pieces that were synthesized.  AST Verifier complains about this
strange mix while checking source ranges.

rdar://15320934


Swift SVN r9819