Speed up quantification optimizations by unswitching

[milseman]

Unswitch the quant loop.

Comparing against saved benchmark result before_improvements
=== Regressions ======================================================================
- EmailRFCNoMatches_All_Scalar            124ms	122ms	1.97ms		1.6%
- Words_All_Scalar                        12.7ms	12.2ms	476µs		3.9%
- ReluctantQuantWithTerminal_Whole_Scalar 5.51ms	5.2ms	304µs		5.8%
- EmailLookaheadList                      4.07ms	3.91ms	168µs		4.3%
- Css_All                                 3.37ms	3.27ms	101µs		3.1%
- Css_All_Scalar                          2.98ms	2.92ms	56.5µs		1.9%
- EmailBuiltinCharacterClass_All_Scalar   10.1ms	10.1ms	52.2µs		0.5%
- EmailBuiltinCharacterClass_All          10.3ms	10.3ms	48µs		0.5%
- ReluctantQuantWithTerminal_Whole        5.22ms	5.18ms	40.3µs		0.8%
=== Improvements =====================================================================
- CompilerMessages_All                    86.7ms	92ms	-5.24ms		-5.7%
- CompilerMessages_All_Scalar             70ms	75.1ms	-5.14ms		-6.8%
- AnchoredNotFound_All                    13.5ms	14.6ms	-1.1ms		-7.5%
- BasicRangeCCC_All_Scalar                6.4ms	7.14ms	-736µs		-10.3%
- AnchoredNotFound_First                  9.12ms	9.85ms	-733µs		-7.4%
- DiceRollsInText_All_Scalar              38.5ms	39.2ms	-671µs		-1.7%
- EmojiRegex_All_Scalar                   40.5ms	41ms	-557µs		-1.4%
- NotFound_All                            7.18ms	7.56ms	-385µs		-5.1%
- AnchoredNotFound_First_Scalar           5.62ms	6ms	-381µs		-6.4%
- EagarQuantWithTerminal_Whole_Scalar     441µs	783µs	-342µs		-43.7%
- EagarQuantWithTerminal_Whole            446µs	780µs	-334µs		-42.9%
- SubtractionCCC_All                      20.9ms	21.2ms	-264µs		-1.2%
- Words_All                               12.4ms	12.6ms	-259µs		-2.1%
- GraphemeBreakNoCap_All_Scalar           2.83ms	3.09ms	-254µs		-8.2%
- Numbers_All                             5.83ms	6.07ms	-240µs		-3.9%
- Numbers_All_Scalar                      5.09ms	5.33ms	-237µs		-4.5%
- CaseInsensitiveCCC_All                  6.35ms	6.56ms	-218µs		-3.3%
- GraphemeBreakNoCap_All                  2.99ms	3.2ms	-209µs		-6.5%
- NotFound_All_Scalar                     6.17ms	6.35ms	-177µs		-2.8%
- BasicBuiltinCharacterClass_All          8.09ms	8.27ms	-177µs		-2.1%
- LiteralSearchNotFound_All_Scalar        5.52ms	5.67ms	-154µs		-2.7%
- LiteralSearch_All_Scalar                5.72ms	5.87ms	-151µs		-2.6%
- BasicBuiltinCharacterClass_All_Scalar   7.09ms	7.23ms	-141µs		-2.0%
- EmailLookahead_All                      19.4ms	19.6ms	-132µs		-0.7%
- BasicCCC_All                            5.92ms	6.05ms	-123µs		-2.0%
- LiteralSearch_All                       6.69ms	6.82ms	-122µs		-1.8%
- BasicRangeCCC_All                       6.4ms	6.52ms	-121µs		-1.9%
- CaseInsensitiveCCC_All_Scalar           6.35ms	6.47ms	-116µs		-1.8%
- AnchoredNotFound_All_Scalar             9.56ms	9.68ms	-115µs		-1.2%
- HangulSyllable_All_Scalar               5.91ms	6.02ms	-112µs		-1.9%
- BasicCCC_All_Scalar                     5.93ms	6.04ms	-108µs		-1.8%
- HangulSyllable_First                    3.27ms	3.37ms	-92.4µs		-2.7%
- IntersectionCCC_All_Scalar              22ms	22.1ms	-89.7µs		-0.4%
- HangulSyllable_First_Scalar             2.84ms	2.92ms	-83.7µs		-2.9%
- HangulSyllable_All                      6.69ms	6.76ms	-78µs		-1.2%
- LiteralSearchNotFound_All               6.55ms	6.62ms	-68.8µs		-1.0%
- Lines_All_Scalar                        1.66ms	1.7ms	-44.8µs		-2.6%
- IPv4Address_Scalar                      2.05ms	2.1ms	-42.7µs		-2.0%
- DiceNotation                            4.51ms	4.55ms	-39.7µs		-0.9%
- DiceNotation_Scalar                     4.26ms	4.3ms	-37.7µs		-0.9%
- IPv6Address                             2.55ms	2.59ms	-35.5µs		-1.4%
- EmailLookaheadList_Scalar               3.66ms	3.69ms	-29.5µs		-0.8%

[milseman]

@swift-ci please test

[milseman]

This is now superseded by a larger PR that includes much more cleanup, refactoring, and preparation for more improvements.