Clean up the manpage and conditionalize various portions according to how
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.
diff --git a/jemalloc/README b/jemalloc/README
new file mode 100644
index 0000000..de3a0a8
--- /dev/null
+++ b/jemalloc/README
@@ -0,0 +1,4 @@
+jemalloc is a general-purpose scalable concurrent malloc(3) implementation.
+
+The INSTALL file contains information on how to configure, build, and install
+jemalloc.