[SR-3912] Decide the cap of alignment for struct layout

[ematejska]

Previous ID	SR-3912
Radar	rdar://problem/31411216
Original Reporter	@ematejska
Type	Sub-task
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Sub-task, AffectsABI
Assignee	None
Priority	Medium

md5: 7bd55cfd7fcf32900e0a5358d232fd4f

Parent-Task:

• SR-7809 Define layout algorithm for structs

Issue Description:

Explore whether there are implementation benefits to capping alignment of structs at some number, e.g. 16 on many platforms.

[bob-wilson]

@swift-ci create

[rjmccall]

#15691

[bob-wilson]

This is done now.