[PATCH] D62780: msabi: Fix exponential mangling time for even more contrived inputs

[Nico Weber via Phabricator via cfe-commits]

thakis created this revision.
thakis added a reviewer: rnk.

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.


https://reviews.llvm.org/D62780

Files:
  clang/lib/AST/MicrosoftMangle.cpp
  clang/test/CodeGenCXX/mangle-ms-back-references-pr13207.cpp

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