Nico Weber 487077698c 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

llvm-svn: 362560

2019-06-04 23:27:40 +00:00

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