jemalloc 4.2.1 released

[Jason Evans]

jemalloc 4.2.1 is now available.

Bug fixes:
- Fix bootstrapping issues for configurations that require allocation during tsd initialization (e.g. --disable-tls). (@cferris1000, @jasone)
- Fix gettimeofday() version of nstime_update(). (@ronawho)
- Fix Valgrind regressions in calloc() and chunk_alloc_wrapper(). (@ronawho)
- Fix potential VM map fragmentation regression. (@jasone)
- Fix opt_zero-triggered in-place huge reallocation zeroing. (@jasone)
- Fix heap profiling context leaks in reallocation edge cases. (@jasone)

For the complete ChangeLog, see:
	https://github.com/jemalloc/jemalloc/raw/4.2.1/ChangeLog

Direct download:
	https://github.com/jemalloc/jemalloc/releases/download/4.2.1/jemalloc-4.2.1.tar.bz2

Starting point for general information:
	http://www.canonware.com/jemalloc/

Browsable revision history:
	https://github.com/jemalloc/jemalloc/tree/4.2.1