[ABI] Associated conformance resilience

[DougGregor]

Implement resilience for the associated conformances of a protocol, e.g., the SubSequence: Collection requirement of the Collection protocol. This involves the usual steps:

• Define an associated conformance descriptor for each associated conformance requirement
• Use that associated conformance descriptor to compute the index into the witness table when the protocol is treated resiliently
• TODO: Emit associated conformances as part of the resilient witness table for resilient protocols

[DougGregor]

@swift-ci please test

[DougGregor]

@swift-ci please benchmark

[swift-ci]

Build comment file:

Performance: -O

TEST	OLD	NEW	DELTA	RATIO
Regression
IterateData	1570	1737	+10.6%	0.90x (?)
Improvement
DictionaryKeysContainsCocoa	49	42	-14.3%	1.17x

Performance: -Osize

TEST	OLD	NEW	DELTA	RATIO
Regression
IterateData	1629	1824	+12.0%	0.89x

Performance: -Onone

TEST	OLD	NEW	DELTA	RATIO
Improvement
ArrayOfPOD	858	781	-9.0%	1.10x (?)
PointerArithmetics	439997	403866	-8.2%	1.09x

How to read the data

The tables contain differences in performance which are larger than 8% and differences in code size which are larger than 1%.

If you see any unexpected regressions, you should consider fixing the regressions before you merge the PR.

Noise: Sometimes the performance results (not code size!) contain false alarms. Unexpected regressions which are marked with '(?)' are probably noise. If you see regressions which you cannot explain you can try to run the benchmarks again. If regressions still show up, please consult with the performance team (@eeckstein).

Hardware Overview

  Model Name: Mac Pro
  Model Identifier: MacPro6,1
  Processor Name: 12-Core Intel Xeon E5
  Processor Speed: 2.7 GHz
  Number of Processors: 1
  Total Number of Cores: 12
  L2 Cache (per Core): 256 KB
  L3 Cache: 30 MB
  Memory: 64 GB

---