[GHC] Batch modify: #15499, #15667, #8763, #12005, #13704, #14907, ...

[GHC]

Batch modification to #15499, #15667, #8763, #12005, #13704, #14907, #15053, #15196, #15481, #15552, #15578, #13477 by RyanGlScott:
milestone to 8.6.2

Comment:
Moving to the 8.6.2 milestone, since these tickets were all recently marked as merge.

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Tickets URL: <http://ghc.haskell.org/trac/ghc/query?id=15499%2C15667%2C8763%2C12005%2C13704%2C14907%2C15053%2C15196%2C15481%2C15552%2C15578%2C13477>
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