Revert "Add support for libunwind backtrace caching."

This reverts commit adc675c8ef55b59bb2facf795a3c26411cfbf3ed.

The original commit added support for a non-standard libunwind API, so
it was not of general utility.
3 files changed
tree: a6d10c74d25fef31c3d1f1e9d0726aaff8597066
  1. jemalloc/
  2. .gitignore