Commits on Apr 20, 2022

1. babel-cli: avoid SourceMapGenerator for simple map concatenation …

   This removes the last use of `source-map` package from babel-cli. Instead, we use a [SectionedSourceMap](https://github.com/jridgewell/trace-mapping/blob/8db5df070b15e2a669277b710a9d69ad0676524d/src/types.ts#L28-L32), which is purpose built for simple file concatenation like this.
   
   This should be considerably faster to generate sourcemaps now. And, if a sourcemaps are not needed, it's essentially free. As an added benefit, this gives us proper `names` support:
   
   ```diff
   --- a	2022-04-20 11:01:49.000000000 -0400
   +++ b	2022-04-20 11:01:55.000000000 -0400
   @@ -1,12 +1,17 @@
    {
      "version": 3,
      "file": "script2.js",
   -  "names": [],
   +  "names": [ "arr", "map", "x", "MULTIPLIER" ],
      "sources": [
        "script.js"
      ],
      "sourcesContent": [
        "arr.map(x => x * MULTIPLIER);"
      ],
   -  "mappings": ";;AAAA,GAAG,CAAC,GAAJ,CAAQ,UAAA,CAAC;AAAA,SAAI,CAAC,GAAG,UAAR;AAAA,CAAT"
   +  "mappings": ";;AAAAA,GAAG,CAACC,GAAJ,CAAQ,UAAAC,CAAC;AAAA,SAAIA,CAAC,GAAGC,UAAR;AAAA,CAAT"
    }
   ```

   

   jridgewell committed Apr 20, 2022
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2. Dedupe

   

   jridgewell committed Apr 20, 2022
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