TyCoRep: Restore compatibility with 7.10.1
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

(cherry picked from commit ede055eb230ac33da276f1416678f99e32e83da2)

GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc