[stdlib] Remove last addressWithNativeOwner use

[airspeedswift]

Replace with _read

[airspeedswift]

@swift-ci please benchmark

[airspeedswift]

@swift-ci please test

[slavapestov]

Sweet

[airspeedswift]

pls to not jinx the benchmarks

[swift-ci]

Build comment file:

Performance: -O

TEST	OLD	NEW	DELTA	RATIO
Regression
StringEqualPointerComparison	600	657	+9.5%	0.91x

Performance: -Osize

TEST	OLD	NEW	DELTA	RATIO
Regression
StringEqualPointerComparison	571	628	+10.0%	0.91x

Performance: -Onone

TEST	OLD	NEW	DELTA	RATIO
Improvement
ArrayOfGenericPOD2	1180	1066	-9.7%	1.11x (?)
ArrayOfPOD	859	778	-9.4%	1.10x

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

--------------

[slavapestov]

Good enough, ship it

[airspeedswift]

@swift-ci please test

[swift-ci]

Build failed
Swift Test OS X Platform
Git Sha - 7c60187