[SR-3926] Decide the mangling of names stored in named value type metadata

[ematejska]

Previous ID	SR-3926
Radar	rdar://problem/31411194
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: b10257f35c55d51b156674b7fc6004e5

Issue Description:

Ahead of ABI stability, investigate if named value types should store the type name mangled or un-mangled (currently stored mangled) in the type metadata.

[bob-wilson]

@swift-ci create

[bob-wilson]

This is resolved in Swift 4.1.

From Joe Groff: "We changed the layout of nominal type descriptors into hierarchical context descriptors, so that each descriptor stores an unmangled name, and points at the context descriptor for its parent scope, each of which contains an unmangled name going all the way up to the module context."

[bob-wilson]

On second thought, that change came in right after the final branch for 4.1 so this change will land in 4.2.