cc00a15770
jemalloc is configured. Modify arena_malloc() API to avoid unnecessary choose_arena() calls. Remove unnecessary code from choose_arena(). Enable lazy-lock by default, now that choose_arena() is both faster and out of the critical path. Implement objdir support in the build system.
jemalloc is a general-purpose scalable concurrent malloc(3) implementation. The INSTALL file contains information on how to configure, build, and install jemalloc.