[SR-3931] Considering dropping some internal witness table symbols

[ematejska]

Previous ID	SR-3931
Radar	rdar://problem/31411192
Original Reporter	@ematejska
Type	Bug
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, AffectsABI
Assignee	None
Priority	Medium

md5: dee390e7e82c84180be56799a0c1e78b

Issue Description:

Ahead of ABI stability, consider dropping some internal witness table symbols when they don't provide any meaningful information conducive to debugging.

[bob-wilson]

@swift-ci create

[bob-wilson]

Arnold investigated this and concluded that we're not exporting any symbols that we should not. There's nothing to do here.