[stdlib] Misc inlinability fixes

[airspeedswift]

Might need to break these up if they have perf impact but let's see.

[airspeedswift]

@swift-ci please benchmark

[swift-ci]

Build comment file:

Performance: -O

TEST	OLD	NEW	DELTA	RATIO
Regression
Dictionary2	802	946	+18.0%	0.85x
IterateData	1403	1615	+15.1%	0.87x
Dictionary2OfObjects	2081	2274	+9.3%	0.92x (?)

Code size: -O

TEST	OLD	NEW	DELTA	RATIO
Regression
NSStringConversion.o	969	1097	+13.2%	0.88x
CString.o	8098	8466	+4.5%	0.96x
ObjectiveCBridging.o	41352	43176	+4.4%	0.96x
ObjectiveCNoBridgingStubs.o	8053	8181	+1.6%	0.98x
Improvement
DictTest2.o	15721	15257	-3.0%	1.03x
StringInterpolation.o	7355	7163	-2.6%	1.03x

Performance: -Osize

TEST	OLD	NEW	DELTA	RATIO
Regression
Dictionary2	811	1110	+36.9%	0.73x
Dictionary2OfObjects	2161	2434	+12.6%	0.89x
IterateData	1359	1517	+11.6%	0.90x

Code size: -Osize

TEST	OLD	NEW	DELTA	RATIO
Regression
NSStringConversion.o	1066	1274	+19.5%	0.84x
ObjectiveCBridging.o	40087	41127	+2.6%	0.97x
CString.o	8122	8330	+2.6%	0.98x
ObjectiveCNoBridgingStubs.o	7919	8087	+2.1%	0.98x
Improvement
DictTest2.o	14806	14342	-3.1%	1.03x
StringInterpolation.o	6628	6484	-2.2%	1.02x

Performance: -Onone

TEST	OLD	NEW	DELTA	RATIO
Regression
MapReduceLazyCollection	20910	27995	+33.9%	0.75x
ArrayAppendLazyMap	164376	213145	+29.7%	0.77x
DropFirstArrayLazy	30637	39263	+28.2%	0.78x
DropLastArrayLazy	10221	13066	+27.8%	0.78x
PrefixArrayLazy	31104	39587	+27.3%	0.79x
SuffixArrayLazy	10377	13002	+25.3%	0.80x
MapReduceLazyCollectionShort	32815	40183	+22.5%	0.82x
ChainedFilterMap	230936	279232	+20.9%	0.83x
StringWordBuilderReservingCapacity	2461	2719	+10.5%	0.91x
Improvement
RemoveWhereQuadraticString	2756	2501	-9.3%	1.10x

Code size: Swift libraries

TEST	OLD	NEW	DELTA	RATIO
Regression
libswiftObjectiveC.dylib	16384	20480	+25.0%	0.80x

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

---

[airspeedswift]

@swift-ci please smoke test and merge

[airspeedswift]

@swift-ci please smoke test and merge

[swift-ci]

Build failed
Swift Test Linux Platform
Git Sha - 1f9cce61127f8dbcec034e0669d1aa4817491439

[swift-ci]

Build failed
Swift Test OS X Platform
Git Sha - 1f9cce61127f8dbcec034e0669d1aa4817491439