Test

fix: avoid to visit nullptr in binaryen #4896

Job	Run time
Check	4s
Bootstrap (debug)	4m 17s
Features	25s
Runtimes	32s
Bootstrap (release)	5m 5s
Compiler (windows, node lts/*)	2m 9s
Loader	21s
Compiler (macos, node lts/*)	1m 38s
Coverage	4m 3s
Compiler (ubuntu, node current)	1m 47s
Compiler (ubuntu, node lts/*)	1m 52s
Compiler (macos, node current)	1m 20s
Compiler (windows, node current)	1m 52s
	25m 25s

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