swift234

[IDE/CodeCompletion] Make code completion include the leading paren in calls.
The leading paren is included for display purposes only, not inserted
in the code if already present. It makes the displayed text in the
code completion list symmetrical with respect to open/close parens.

Add markups when printing annotation chunks so it becomes testable.
Update tests accordingly, and include tests for leading parens.

This addresses <rdar://problem/16918310>.

Swift SVN r18126