[1046] Maintain source mapping for merged sibling vars. #1047
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The plugin babel-plugin-transform-merge-sibling-variables does not maintain source mapping when merging sibling variable declarators into a single declaration after babel-plugin-transform-modules-commonjs has been applied.
To Reproduce:
Minify a file that has been processed with babel-plugin-transform-modules-commonjs. If the original file has more than one import statement, the mapping will be lost.
Minimal code to reproduce the bug: #1046