Remove unnecessary BigInt conditional usage #3396

Job	Run time
Build Babel Artifacts on Windows	2m 19s
test262 - Prepare for running in parallel	0s
Prepare Cache	30s
Test on Node.js Latest	2m 40s
Build Babel Artifacts	1m 15s
Build Babel 8 Artifacts	5m 38s
Test ESM version (23)	2m 15s
Validate Yarn dependencies and constraints	26s
Test ESM version (22)	2m 21s
Lint	5m 7s
Test @babel/eslint-* with ESLint 8.0.0	36s
Test @babel/runtime integrations	1m 27s
Third-party Parser Tests	1m 59s
Test @babel/eslint-* with ESLint 7.5.0	37s
Test on (windows-latest)	2m 20s
Test on (macos-latest)	2m 53s
Test on Node.js (22)	1m 36s
Test on Node.js (20)	1m 42s
Test on Node.js (18)	1m 38s
Test on Node.js (16)	1m 52s
Test on Node.js (14)	1m 51s
Test on Node.js (12)	1m 58s
test262	0s
Test on Node.js (10)	2m 31s
Test on Node.js (8)	2m 42s
Test on Node.js (6)	3m 42s
test262 - Analyze results	0s
Test Babel 8 breaking changes on (ubuntu-latest)	1m 35s
Test Babel 8 breaking changes on (windows-latest)	2m 40s
Test Babel 8 breaking changes on (macos-latest)	1m 31s
	57m 41s

Provide feedback