TyCoRep: Restore compatibility with 7.10.1
Sadly CallStack wasn't present in 7.10.1, breaking the build when bootstrapping from this version. This patch essentially disables CallStack support for stage1 builds with 7.10.*. This doesn't seem so unreasonable though as stage2 will still work. Test Plan: Validate with 7.10.1 Reviewers: gridaphobe, jstolarek, austin Reviewed By: jstolarek Subscribers: thomie, jstolarek Differential Revision: https://phabricator.haskell.org/D1812 GHC Trac Issues: #11472
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