disable jemalloc on executables for ios targets#46211

Merged

bors merged 2 commits intorust-lang:masterfrom

snipsco:master

Dec 1, 2017

Commits on Nov 23, 2017

disable jemalloc on exectuable for ios targets
kali
committed

Commits on Nov 30, 2017

explanatory note for the workaround
kali
committed