Yuki Okushi 4859786c69
Rollup merge of #77890 - gilescope:welformed-json-output-from-libtest, r=KodrAus
Fixing escaping to ensure generation of welformed json.

doc tests' json name have a filename in them. When json test output is asked for on windows currently produces invalid json.
Tracking issue for json test output: #49359
2020-10-23 18:26:20 +09:00
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