LibJS: Outline cold AsmInt interpreter paths #33370

Job	Run time
Linux, x86_64, Fuzzers, Clang / CI	2m 54s
Linux, x86_64, All_Debug, Clang / CI	2m 51s
Linux, x86_64, Release, GNU / CI	4m 51s
Linux, x86_64, Sanitizer, Clang / CI	7m 56s
macOS, arm64, Sanitizer, Clang / CI	53m 12s
Linux, arm64, Sanitizer, Clang / CI	18m 0s
Windows, x86_64, Sanitizer, ClangCL / CI	7m 6s
	1h 36m 50s

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