Extract function not detected when assigned to a variable

[mkshiblu]

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webpack	1e4b1c72125e826aba32e99d62464db4613ed64f	EXTRACT	Function	lib/wasm/WebAssemblyGenerator.js:4286-6120	rewriteImportedGlobals	lib/wasm/WebAssemblyGenerator.js:4047-4511	createDefaultInitForGlobal