Fix decorator initProto usage in derived classes #10464

Job	Run time
Build Babel Artifacts on Windows	1m 44s
Prepare Cache	23s
test262 - Prepare for running in parallel	31s
Validate Yarn dependencies and constraints	28s
Test ESM version	2m 29s
Build Babel 8 Artifacts	2m 42s
Test on Node.js Latest	2m 58s
Build Babel Artifacts	1m 19s
Lint	2m 2s
Test @babel/runtime integrations	1m 18s
Test @babel/eslint-* with ESLint 7.5.0	37s
Test on Node.js (20)	1m 29s
Test on Node.js (18)	1m 32s
Test on Node.js (16)	1m 44s
Third-party Parser Tests	1m 43s
test262 (0)	10m 59s
Test on Node.js (14)	1m 45s
Test on Windows	2m 11s
test262 (1)	7m 24s
Test on Node.js (12)	1m 59s
test262 (2)	8m 28s
test262 (3)	7m 23s
Test on Node.js (10)	2m 58s
test262 (4)	9m 0s
Test on Node.js (8)	3m 33s
test262 (5)	8m 3s
test262 (6)	8m 36s
Test on Node.js (6)	4m 31s
test262 (7)	6m 23s
Test Babel 8 breaking changes on (ubuntu-latest)	1m 50s
Test Babel 8 breaking changes on (windows-latest)	3m 4s
test262 - Analyze results	46s
	1h 51m 52s

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