SILOptimizer: run the GlobalOpt pass in the mandatory pipeline.

[eeckstein]

Replace the dynamic initialization of trivial globals with statically initialized globals.
This is required to be able to use global variables in performance-annotated functions.
Also, it's a small performance improvement for -Onone.

[eeckstein]

@swift-ci test

[eeckstein]

@swift-ci benchmark

[swift-ci]

Performance (x86_64): -O

Regression	OLD	NEW	DELTA	RATIO
NSError	167	203	+21.6%	0.82x (?)
ObjectiveCBridgeStubFromNSDateRef	4380	5030	+14.8%	0.87x (?)

Code size: -O

Performance (x86_64): -Osize

Regression	OLD	NEW	DELTA	RATIO
ArrayAppendGenericStructs	2140	2480	+15.9%	0.86x (?)
Improvement	OLD	NEW	DELTA	RATIO
ObjectiveCBridgeFromNSArrayAnyObjectForced	7300	6620	-9.3%	1.10x (?)
StringToDataLargeUnicode	3950	3600	-8.9%	1.10x (?)

Code size: -Osize

Performance (x86_64): -Onone

Regression	OLD	NEW	DELTA	RATIO
ArrayAppendOptionals	1370	1560	+13.9%	0.88x (?)
Improvement	OLD	NEW	DELTA	RATIO
ExclusivityIndependent	190	177	-6.8%	1.07x (?)

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 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

[swift-ci]

Build failed
Swift Test Linux Platform
Git Sha - c68dc9a

[eeckstein]

@swift-ci test

[swift-ci]

Build failed
Swift Test Linux Platform
Git Sha - 69ed2e453659753081bb255f14ce5800695603a9

[eeckstein]

@swift-ci test linux

[swift-ci]

Build failed
Swift Test OS X Platform
Git Sha - 69ed2e453659753081bb255f14ce5800695603a9

[swift-ci]

Build failed
Swift Test Linux Platform
Git Sha - 69ed2e453659753081bb255f14ce5800695603a9

[eeckstein]

@swift-ci test

[swift-ci]

Build failed
Swift Test Linux Platform
Git Sha - 06c9686f7101d27d8f9c19c844838e9d19544116

[swift-ci]

Build failed
Swift Test OS X Platform
Git Sha - 06c9686f7101d27d8f9c19c844838e9d19544116

[eeckstein]

@swift-ci test