circleci: Don't use xlarge instances

Authored by bgamari on Dec 17 2018, 9:38 PM.

Description

circleci: Don't use xlarge instances

As discussed on ghc-devops, CircleCI is changing their billing policy to require
users of instances larger than medium to use a paid account. Consequently
these instances will no longer be available to us starting tomorrow.

Details

Committed
bgamariDec 17 2018, 9:42 PM
Parents
rGHCde115f90158b: darwin: Build with in-tree GMP
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