[ownership] Move OME past SILMem2Reg

[meg-gupta]

No description provided.

[meg-gupta]

@swift-ci test

[meg-gupta]

@swift-ci test source compatibility

[meg-gupta]

@swift-ci benchmark

[swift-ci]

Performance: -O

Regression	OLD	NEW	DELTA	RATIO
FlattenListLoop	968	1378	+42.4%	0.70x (?)
Improvement	OLD	NEW	DELTA	RATIO
EqualSubstringSubstring	30	22	-26.7%	1.36x
LessSubstringSubstring	30	23	-23.3%	1.30x
EqualStringSubstring	30	23	-23.3%	1.30x (?)
EqualSubstringSubstringGenericEquatable	30	23	-23.3%	1.30x
EqualSubstringString	30	23	-23.3%	1.30x
LessSubstringSubstringGenericComparable	30	23	-23.3%	1.30x
StringComparison_longSharedPrefix	364	327	-10.2%	1.11x
SortStringsUnicode	2290	2060	-10.0%	1.11x (?)

Code size: -O

Performance: -Osize

Improvement	OLD	NEW	DELTA	RATIO
EqualSubstringSubstring	30	22	-26.7%	1.36x (?)
EqualSubstringSubstringGenericEquatable	30	22	-26.7%	1.36x (?)
EqualSubstringString	30	22	-26.7%	1.36x (?)
LessSubstringSubstring	30	23	-23.3%	1.30x
EqualStringSubstring	30	23	-23.3%	1.30x (?)
LessSubstringSubstringGenericComparable	30	23	-23.3%	1.30x
SortStringsUnicode	2295	2050	-10.7%	1.12x (?)
StringComparison_longSharedPrefix	364	327	-10.2%	1.11x

Code size: -Osize

Performance: -Onone

Improvement	OLD	NEW	DELTA	RATIO
EqualSubstringSubstringGenericEquatable	90	82	-8.9%	1.10x (?)
EqualSubstringSubstring	91	83	-8.8%	1.10x
EqualStringSubstring	90	83	-7.8%	1.08x (?)
EqualSubstringString	90	83	-7.8%	1.08x (?)
LessSubstringSubstringGenericComparable	90	83	-7.8%	1.08x (?)
SortStringsUnicode	3325	3090	-7.1%	1.08x (?)

Code size: -swiftlibs

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 mini
  Model Identifier: Macmini8,1
  Processor Name: 6-Core Intel Core i7
  Processor Speed: 3.2 GHz
  Number of Processors: 1
  Total Number of Cores: 6
  L2 Cache (per Core): 256 KB
  L3 Cache: 12 MB
  Memory: 64 GB