Commits on May 15, 2020

1. Update jemalloc to version 5.2.1 …

   This release is primarily about Windows. A critical virtual memory leak is resolved on all Windows platforms.
   The regression was present in all releases since 5.0.0.
   
   Bug fixes:
     - Fix a severe virtual memory leak on Windows. This regression was first released in 5.0.0.
     - Fix size 0 handling in posix_memalign(). This regression was first released in 5.2.0.
     - Fix the prof_log unit test which may observe unexpected backtraces from compiler optimizations. The test was first added in 5.2.0.
     - Fix the declaration of the extent_avail tree. This regression was first released in 5.1.0.
     - Fix an incorrect reference in jeprof. This functionality was first released in 3.0.0.
     - Fix an assertion on the deallocation fast-path. This regression was first released in 5.2.0.
     - Fix the TLS_MODEL attribute in headers. This regression was first released in 5.0.0.
   
   Optimizations and refactors:
     - Implement opt.retain on Windows and enable by default on 64-bit.
     - Optimize away a branch on the operator delete path.
     - Add format annotation to the format generator function.
     - Refactor and improve the size class header generation.
     - Remove best fit.
     - Avoid blocking on background thread locks for stats.

   

   fwyzard committed May 15, 2020
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