Backout the port of bug 414946 Disable jemalloc on Mac for now due to a packing error (bug 670468) and other issues. r=nightly update bustage fix

configure.in

@@ -1913,7 +1913,6 @@ ld.])
     else
         MOZ_OPTIMIZE_FLAGS="-O3 -fno-omit-frame-pointer"
     fi
-    MOZ_MEMORY=1
     _PEDANTIC=
     CFLAGS="$CFLAGS -fpascal-strings -fno-common"
     CXXFLAGS="$CXXFLAGS -fpascal-strings -fno-common"