Speeding up compilation by using jemalloc

[weaselcat via Digitalmars-d]

Might be of use to someone, but I was looking for ways to speed 
up dmd's albeit already fast compilation times.

Just by dropping in jemalloc in place of glibc's malloc via 
LD_PRELOAD on my linux machine I saw a 10-15% drop in compilation 
times across the board. Not sure if this is common knowledge or 
not.

(Sorry if this takes away from your coffee time : ) )