fix: pass sourcemap into Rollup treeShakingPlugin

[aleclarson]

Fixes #889

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Name	Status	Preview	Comments	Updated (UTC)
tsup	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 21, 2023 4:44pm

[aleclarson]

Hmm, still not producing correct sourcemaps...

Could be something to do with:

tsup/src/plugin.ts

Lines 156 to 166 in 322cb77

	if (result.map) {
	const originalConsumer = await new SourceMapConsumer(
	parseSourceMap(info.map)
	)
	const newConsumer = await new SourceMapConsumer(
	parseSourceMap(result.map)
	)
	const generator =
	SourceMapGenerator.fromSourceMap(originalConsumer)
	generator.applySourceMap(newConsumer, info.path)
	info.map = generator.toJSON()

…or maybe it's a Rollup bug?