[2018-10] [corlib] Ensure that Console Streams are thread-safe #11230
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Backport of #11205.
/cc @marek-safar @alexischr
Description:
The Console class wraps the standard system stream reader/writers on construction so as to expose them as thread-safe. However, the Set-Out/In/Err methods in referencesource do not do the same when they replace default targets.
CoreFX code does: https://github.com/mono/corefx/blob/1748f6492e8b96842f76e1a9e7b5d7e8ccfca480/src/System.Console/src/System/Console.cs#L412-L444
Possible fix for #11146