Apply only allowed attributes to generated functions #1679

Job	Run time
Check	58s
Rustfmt	7s
Run wasm-bindgen crate tests (unix)	7m 6s
Clippy	5m 1s
build_nightly	1m 31s
build_examples	3m 22s
build_benchmarks	50s
Verify that web-sys is compiled correctly	45s
dist_linux_x86_64_musl	2m 20s
Run js-sys crate tests	2m 0s
Run native tests	1m 43s
Build and test the deno example	45s
Run wasm-bindgen crate tests with multithreading enabled	1m 25s
Test TypeScript output of wasm-bindgen	1m 9s
Run UI compile-fail tests	2m 54s
Run web-sys crate tests	5m 57s
Run wasm-bindgen-webidl crate tests	2m 7s
dist_linux_aarch64_gnu	2m 47s
dist_macos_aarch64	1m 40s
dist_macos_x86_64	7m 12s
dist_windows	3m 31s
doc_api	1m 11s
doc_book	17s
test_examples	1m 57s
deploy	58s
	59m 33s

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