Refactor visitors merging #9247

Job	Run time
Build Babel Artifacts on Windows	1m 58s
Prepare Cache	20s
test262 - Prepare for running in parallel	42s
Validate Yarn dependencies and constraints	29s
Build Babel Artifacts	1m 53s
Test on Node.js Latest	3m 49s
Build Babel 8 Artifacts	3m 29s
Test ESM version	5m 45s
Third-party Parser Tests	2m 11s
Lint	2m 37s
Test @babel/eslint-* with ESLint 7.5.0	38s
Test @babel/runtime integrations	2m 13s
test262 (0)	19m 44s
test262 (1)	13m 59s
test262 (2)	16m 51s
test262 (3)	19m 14s
test262 (4)	17m 42s
test262 (5)	16m 34s
test262 (6)	17m 0s
test262 (7)	14m 18s
Test on Windows	4m 9s
Test on Node.js (18)	3m 28s
Test on Node.js (16)	3m 9s
Test on Node.js (14)	3m 49s
Test on Node.js (12)	3m 38s
Test on Node.js (10)	7m 45s
Test on Node.js (8)	11m 47s
Test on Node.js (6)	11m 26s
Test Babel 8 breaking changes on (ubuntu-latest)	2m 55s
Test Babel 8 breaking changes on (windows-latest)	5m 0s
test262 - Analyze results	35s
	3h 39m 7s

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