refactor(transformer): helper loader methods take `Span` #22296

Job	Run time
Build Linter Benchmark	3m 1s
Benchmark (lexer)	1m 26s
Benchmark (parser)	2m 20s
Benchmark (transformer)	2m 27s
Benchmark (isolated_declarations)	1m 41s
Benchmark (semantic)	1m 39s
Benchmark (minifier)	2m 13s
Benchmark (codegen)	1m 33s
Benchmark (sourcemap)	2m 1s
Benchmark linter (0)	3m 11s
Benchmark linter (1)	1m 39s
Upload benchmarks	14s
	23m 25s

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