msabi: Fix exponential mangling time for even more contrived inputs

msabi: Fix exponential mangling time for even more contrived inputs

This is a follow-up to r362293 which fixed exponential time needed
for mangling certain templates. This fixes the same issue if that
template pattern happens in template arguments > 10: The first
ten template arguments can use back references, and r362293 added
caching for back references. For latter arguments, we have to add
a cache for the mangling itself instead.

Fixes PR42091 even more.

Differential Revision: https://reviews.llvm.org/D62780

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@362560 91177308-0d34-0410-b5e6-96231b3b80d8