Fix importing symbol polyfill in `@babel/runtime-corejs2` #9016

Job	Run time
Build Babel Artifacts on Windows	1m 58s
test262 - Prepare for running in parallel	28s
Prepare Cache	17s
Test ESM version	4m 12s
Test on Node.js Latest	4m 13s
Build Babel Artifacts	1m 49s
Build Babel 8 Artifacts	3m 8s
Validate Yarn dependencies and constraints	50s
Lint	2m 36s
Test on Node.js (18)	3m 12s
Test on Node.js (16)	3m 22s
Test on Node.js (14)	4m 37s
Test on Node.js (12)	3m 49s
Test on Node.js (10)	6m 23s
Test on Node.js (8)	8m 38s
Test on Node.js (6)	10m 25s
Test @babel/eslint-* with ESLint 7.5.0	1m 5s
Third-party Parser Tests	2m 1s
Test @babel/runtime integrations	2m 7s
test262 (0)	1m 27s
test262 (1)	1m 43s
test262 (2)	1m 56s
test262 (3)	1m 35s
test262 (4)	1m 55s
test262 (5)	1m 34s
test262 (6)	1m 36s
test262 (7)	1m 31s
Test on Windows	6m 27s
Test Babel 8 breaking changes on (ubuntu-latest)	4m 17s
Test Babel 8 breaking changes on (windows-latest)	4m 46s
test262 - Analyze results	19s
	1h 34m 16s

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